How hernia happens via deep and superficial ring i dont understand the anatomy and the mechanism explain please with pictures and tell me what is the landmark for them w 2 rings

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anatomy illustration of inguinal canal showing deep and superficial inguinal rings and inferior epigastric vessels

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inguinal hernia anatomy

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inguinal canal deep superficial ring anatomy landmark inferior epigastric vessels authoritative

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https://www.ncbi.nlm.nih.gov/books/NBK537156/figure/article-…

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Think of the inguinal canal as a slanting tunnel through the lower abdominal wall. It has:

an entrance from inside the abdomen: the deep inguinal ring
an exit nearer the skin/groin: the superficial inguinal ring

The tunnel runs downwards and medially, just above the inguinal ligament, for about 4 cm.

Inguinal canal anatomy showing the route from deep to superficial ring

The simple map

Inside abdomen                         Groin / outside

Peritoneum
    |
    |  Deep ring                  Inguinal canal             Superficial ring
    |  (entrance)                 slants down + medially      (exit)
    V
 [   O   ]  ---------------------------------------------->  [  /\  ]
                                                                  |
                                                           spermatic cord
                                                           then scrotum

In men, the spermatic cord normally goes through this route to the scrotum. In women, the round ligament of the uterus passes through it.

The two rings: what they actually are

1. Deep inguinal ring = inner entrance

It is an opening in the transversalis fascia, a deep layer of the abdominal wall.

Key landmark:

Located about 1-1.5 cm above the midpoint of the inguinal ligament
Lateral to the inferior epigastric vessels

The most useful exam/surgery rule:

Deep ring is lateral to the inferior epigastric vessels.

Deep inguinal ring and its relation to the inguinal ligament and vessels

Important landmark distinction:

Midpoint of inguinal ligament = halfway between ASIS and pubic tubercle
Mid-inguinal point = halfway between ASIS and pubic symphysis

These are close but not identical. The deep ring is classically described as just above the mid-inguinal point, and is often surface-marked just above the midpoint region of the inguinal ligament.

2. Superficial inguinal ring = outer exit

It is a triangular/slit-like opening in the external oblique aponeurosis, a more superficial muscle-tendon layer.

Key landmark:

Just above and lateral to the pubic tubercle
This is the one near the skin that can be felt clinically, especially by invaginating scrotal skin with a finger.

Superficial ring is above and lateral to the pubic tubercle.

The canal starts at the deep ring and ends at the superficial ring. [Gray's Anatomy for Students, p. 352] describes the deep ring as immediately lateral to the inferior epigastric vessels and the superficial ring as superior to the pubic tubercle.

How hernias use this anatomy

A hernia is abdominal fat or bowel pushing outward, usually carrying a lining of peritoneum called the hernial sac.

There are two main inguinal hernia routes.

A. Indirect inguinal hernia: takes the whole tunnel

Abdomen
   |
   |  enters DEEP ring
   V
  [deep ring] ---> through inguinal canal ---> [superficial ring]
                                                    |
                                             may enter scrotum

Mechanism

The hernia starts lateral to the inferior epigastric vessels, enters the deep ring, then follows the same route as the spermatic cord.

If large, it comes out through the superficial ring and can descend into the scrotum.

This often reflects a persistent embryological passage, the processus vaginalis, although it may present later in life when raised abdominal pressure pushes fat or bowel into that route. [Gray's Anatomy for Students, p. 352] notes that failure of processus vaginalis obliteration creates a potential weakness.

One-line memory aid

Indirect = Into the deep ring.

And:

Indirect = lateral to inferior epigastric vessels.

B. Direct inguinal hernia: pushes through the back wall, not through the deep ring

Abdominal pressure
       |
       V
 Weak posterior wall of inguinal canal
       |
       V
  Direct hernia bulges forward
       |
  near/through superficial ring

A direct hernia does not enter through the deep ring. Instead, it pushes forward through a weak area in the posterior wall of the canal called Hesselbach triangle.

Hesselbach triangle boundaries

             Rectus abdominis
                  | 
                  |  medial boundary
                  |
      Direct hernia bulges here
                  |
inferior epigastric vessels       inguinal ligament
        lateral boundary          inferior boundary

So:

Direct = medial to inferior epigastric vessels.

It is usually acquired from weakening of the abdominal wall over time, with factors such as aging, chronic cough, constipation/straining, or repeated raised intra-abdominal pressure.

The comparison that makes it click

Feature	Indirect inguinal hernia	Direct inguinal hernia
Starts at deep ring?	Yes	No
Goes through full inguinal canal?	Yes	No, pushes through posterior wall
Relation to inferior epigastric vessels	Lateral	Medial
Can reach scrotum?	Commonly can	Less commonly
Usual mechanism	Patent/deep-ring pathway plus pressure	Acquired posterior-wall weakness
Memory phrase	“Through the door and tunnel”	“Through the weak wall”

The single most useful mental image

Imagine the abdominal wall as a house:

Deep ring = the back door into a hallway
Inguinal canal = the hallway
Superficial ring = the front door

An indirect hernia enters the back door, walks through the hallway, and may exit the front door.

A direct hernia does not use the back door. It breaks through a weak part of the hallway's back wall, then bulges forward.

Clinical surface landmark

A groin swelling above and medial to the pubic tubercle is generally an inguinal hernia. A swelling below and lateral to the pubic tubercle suggests a femoral hernia, which is a different route and needs prompt assessment because it is more prone to trapping bowel.

Show a labeled diagram of the two inguinal rings

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labeled inguinal canal diagram deep inguinal ring superficial inguinal ring anatomy

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labeled diagram deep superficial inguinal rings inferior epigastric vessels

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inguinal hernia anatomy

Inguinal canal with both rings labeled

Labeled inguinal canal diagram showing deep inguinal ring at the abdominal entrance and superficial inguinal ring near the pubic tubercle

Deep ring close-up

Deep inguinal ring labeled with inguinal ligament and relevant deep abdominal wall anatomy

ASIS ------------------------------------------- Pubic tubercle
       \___________ inguinal ligament __________/

                     ↑
              DEEP INGUINAL RING
      Just above the inguinal ligament
      LATERAL to inferior epigastric vessels

                \  inguinal canal  /
                 \   down + medial/
                  \               /
                   ↓
         SUPERFICIAL INGUINAL RING
         Just ABOVE and LATERAL to pubic tubercle

The deep ring is the internal entrance to the canal, formed in the transversalis fascia. The superficial ring is the external exit, a triangular opening in the external oblique aponeurosis. The canal runs between them. An indirect hernia enters at the deep ring, whereas a direct hernia pushes through the posterior wall medial to the inferior epigastric vessels. [Gray's Anatomy for Students, p. 352]

Wha is pubic tubercle

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pubic tubercle anatomy

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pubic tubercle anatomy landmark inguinal ligament authoritative

The pubic tubercle is a small, hard bony bump on each side of the front of your pelvis, very close to the midline.

It is the medial attachment point of the inguinal ligament.

ASIS (front hip bone) ------------------------ Pubic tubercle
        \_________ inguinal ligament _________/
                                                  ↑
                                     small bony bump you can feel

How to find it on yourself

Find the center of the lower pelvis, where the two pubic bones meet. This is the pubic symphysis.
Move your finger a little to the right or left.
You can feel a firm bony prominence: that is the pubic tubercle.

It is a key landmark because:

The superficial inguinal ring lies just above and lateral to it.
An inguinal hernia is usually above and medial to it.
A femoral hernia is usually below and lateral to it.
The inguinal ligament runs from the front point of the hip bone, the ASIS, to the pubic tubercle. StatPearls description of the inguinal ligament

How the bowel protrudeds from rectus abdomisnis

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labeled diagram direct inguinal hernia Hesselbach triangle rectus abdominis inferior epigastric vessels

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inguinal hernia anatomy

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direct inguinal hernia Hesselbach triangle rectus abdominis mechanism anatomy

The bowel does not usually push through the rectus abdominis muscle itself.

A direct inguinal hernia pushes through a weak spot beside the rectus muscle, through the deep supporting layer called the transversalis fascia.

Hesselbach triangle showing the location of a direct inguinal hernia

Where exactly does it come through?

Look at the lower abdominal wall from inside:

                 MIDLINE
                    |
              Rectus abdominis
                    |
                    |\
                    | \       ← weak area:
                    |  \         Hesselbach triangle
                    |   \
                    |    \  Inferior epigastric vessels
                    |     \       (lateral border)
--------------------|------\----------------
          Inguinal ligament  (bottom border)

The triangle is bounded by:

Medially: lateral border of the rectus abdominis
Laterally: inferior epigastric vessels
Below: inguinal ligament

This triangle is called Hesselbach triangle.

Mechanism step by step

Inside abdomen                   Abdominal wall                   Outside

Bowel + peritoneum
       |
       | Increased pressure from coughing, straining, etc.
       V
  Weak transversalis fascia
  in Hesselbach triangle
       |
       V
  Hernia sac bulges forward
       |
       V
  Groin lump = direct inguinal hernia

So it is like pushing on the inside of a wall where the supporting sheet behind the wall has become weak. The rectus abdominis is the medial border, but the bowel comes through the weak area next to it, not by tearing through it.

A direct hernia is therefore:

Medial to the inferior epigastric vessels
Usually due to acquired weakness of the transversalis fascia
Usually seen with aging or long-term repetitive raised abdominal pressure, such as chronic cough, constipation/straining, or urinary obstruction
Usually does not go through the deep inguinal ring

Direct versus indirect inguinal hernia routes

Compare with an indirect hernia

Direct: bowel pushes through the weak posterior wall beside rectus, within Hesselbach triangle.
Indirect: bowel enters the deep inguinal ring, which is lateral to the inferior epigastric vessels, then travels through the canal.

The anatomical boundaries and the fact that direct hernias pass through the posterior wall of the inguinal canal are described in [Gray's Anatomy for Students, p. 352] and summarized by TeachMeAnatomy's Hesselbach triangle guide.

Can you show the anatomy of each abdominal layer and how it comes out via a gif maybe?

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cross-section layers anterior abdominal wall direct inguinal hernia transversalis fascia Hesselbach triangle labeled

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animated gif direct inguinal hernia abdominal wall layers anatomy

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inguinal hernia anatomy

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mkdir -p "/tmp/workspace/inguinal-hernia-animation/src" "/tmp/workspace/inguinal-hernia-animation/output" && python - <<'PY' from PIL import Image, ImageDraw, ImageFont from pathlib import Path out=Path('/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers.gif') W,H=1200,760 try: font_b=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',28) font=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',22) font_s=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',18) font_xs=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',16) except: font_b=font=font_s=font_xs=None # inside (left) to skin (right), simplified cross-section lower abdominal wall layers=[ ('Bowel / abdominal cavity','#f6ce79',135), ('Parietal peritoneum','#9dd5ea',18), ('Transversalis fascia\n(posterior canal wall)','#8fbf9a',44), ('Transversus abdominis','#bc90c9',72), ('Internal oblique','#d8959e',72), ('External oblique aponeurosis','#e6ac64',55), ('Subcutaneous fat','#f4d6a7',65), ('Skin','#d78e71',36), ] xs=[]; x=80 for n,c,w in layers: xs.append((x,x+w,n,c)); x+=w # Hesselbach weakness: only within transversalis, midpoint y 350 frames=[] for step in range(24): im=Image.new('RGB',(W,H),'#fbfbfc'); d=ImageDraw.Draw(im) # title d.text((45,25),'Direct inguinal hernia: bowel pushes through a weak posterior wall',font=font_b,fill='#202735') d.text((45,62),'Simplified side-on slice: inside abdomen is left; skin/groin is right',font=font_s,fill='#4c566a') y0,y1=165,585 # layers, split fascia around defect when step advanced for a,b,name,c in xs: # draw full rectangles except transversalis fascia (index 2) at defect if 'Transversalis' in name and step>2: gap_top=315; gap_bot=440 d.rectangle((a,y0,b,gap_top),fill=c,outline='#555',width=1) d.rectangle((a,gap_bot,b,y1),fill=c,outline='#555',width=1) else: d.rectangle((a,y0,b,y1),fill=c,outline='#555',width=1) # label centered, rotated omitted use multiline tx=(a+b)//2 # draw label in top portion, slight invisible no lines=name.split('\n') yy=615 for line in lines: bb=d.textbbox((0,0),line,font=font_xs); d.text((tx-(bb[2]-bb[0])/2,yy),line,font=font_xs,fill='#222'); yy+=18 # abbreviate use leader legend colored d.rectangle((48,115,940,130), fill='#dedede') # direction d.polygon([(75,135),(105,125),(105,132),(250,132),(250,138),(105,138),(105,145)],fill='#35495e') d.text((265,122),'pressure from inside abdomen',font=font_s,fill='#35495e') # draw bowel loop that progressively bulges in wall in direct route p=max(0,(step-3)/20) # Bowel starts left then expands into defect; anatomical sac carries peritoneum # use bezier via polygon approximation sampled quadratics import math cx=155 + 530*p cy=377 r=80 # sac/bowel shape follows curve, pure ellipse shifted then waist restriction # peritoneal sac outer if p<0.15: bbox=(80,290,245,465) else: # outlined bulge encroaches into layers; cap at external oblique for direct endx=250+420*p # construct joined silhouette with narrow neck at fascia pts=[(120,300),(200,290),(245,315),(250,350),(270,350)] # elongated dome for i in range(21): t=i/20; pts.append((250+(endx-250)*t,350-95*math.sin(math.pi*t))) pts += [(endx+35,377)] for i in range(20,-1,-1): t=i/20; pts.append((250+(endx-250)*t,405+95*math.sin(math.pi*t))) pts += [(270,405),(250,405),(245,440),(200,465),(120,455)] # sac first d.polygon(pts, fill='#b9e6f0', outline='#206b82') # bowel inner ellipse approximately at distal region bx=max(135,endx-35); d.ellipse((bx-52,cy-56,bx+62,cy+56),fill='#f4bd67',outline='#9a5f22',width=3) d.arc((bx-31,cy-32,bx+33,cy+38),20,320,fill='#aa6d25',width=3) d.arc((bx-20,cy-22,bx+20,cy+25),200,120,fill='#aa6d25',width=2) if step>=3: # labels and arrow a,b,_,_=xs[2] d.line((a-5,285,a-5,315),fill='#bd2e2e',width=5) d.line((a-5,440,a-5,470),fill='#bd2e2e',width=5) d.line((a-25,280,a-5,315),fill='#bd2e2e',width=3) d.text((330,245),'Weak spot in transversalis fascia\n(Hesselbach triangle)',font=font_s,fill='#9e2323') d.line((455,295),(a,330),fill='#9e2323',width=2) # fixed landmarks d.text((665,150),'This is DIRECT:',font=font_b,fill='#8d2630') d.text((665,188),'• Does NOT enter deep ring',font=font_s,fill='#303846') d.text((665,216),'• Pushes through posterior wall',font=font_s,fill='#303846') d.text((665,244),'• Medial to inferior epigastric vessels',font=font_s,fill='#303846') # Stage caption if step<3: msg='1. Abdominal pressure acts outward.' elif step<10: msg='2. Peritoneum and bowel press against a weak area.' elif step<18: msg='3. They bulge through the weakened transversalis fascia.' else: msg='4. The bulge moves forward toward the superficial ring and appears in the groin.' d.rounded_rectangle((50,685,1150,735),radius=12,fill='#eaf0f6',outline='#afc2d4') d.text((75,699),msg,font=font_s,fill='#223449') frames.append(im) frames[0].save(out,save_all=True,append_images=frames[1:],duration=[190]*23+[1200],loop=0,optimize=True) # static png first high clarity frames[-1].save('/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers_final.png') print(out) PY python - <<'PY' from PIL import Image p='/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers.gif' im=Image.open(p) print(im.size, im.n_frames, 'bytes', __import__('os').path.getsize(p)) PY

Running Command

python - <<'PY' p='/tmp/workspace/inguinal-hernia-animation/src/make_gif.py' script=r'''from PIL import Image, ImageDraw, ImageFont from pathlib import Path import math out=Path('/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers.gif') W,H=1200,760 font_b=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',28) font=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',22) font_s=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',18) font_xs=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',16) layers=[('Bowel / abdominal cavity','#f6ce79',135),('Parietal peritoneum','#9dd5ea',18),('Transversalis fascia\n(posterior canal wall)','#8fbf9a',44),('Transversus abdominis','#bc90c9',72),('Internal oblique','#d8959e',72),('External oblique aponeurosis','#e6ac64',55),('Subcutaneous fat','#f4d6a7',65),('Skin','#d78e71',36)] xs=[]; x=80 for n,c,w in layers: xs.append((x,x+w,n,c)); x+=w frames=[] for step in range(24): im=Image.new('RGB',(W,H),'#fbfbfc'); d=ImageDraw.Draw(im) d.text((45,25),'Direct inguinal hernia: bowel pushes through a weak posterior wall',font=font_b,fill='#202735') d.text((45,62),'Simplified side-on slice: inside abdomen is left; skin/groin is right',font=font_s,fill='#4c566a') y0,y1=165,585 for a,b,name,c in xs: if 'Transversalis' in name and step>2: d.rectangle((a,y0,b,315),fill=c,outline='#555',width=1); d.rectangle((a,440,b,y1),fill=c,outline='#555',width=1) else: d.rectangle((a,y0,b,y1),fill=c,outline='#555',width=1) tx=(a+b)//2; yy=615 for line in name.split('\n'): bb=d.textbbox((0,0),line,font=font_xs); d.text((tx-(bb[2]-bb[0])/2,yy),line,font=font_xs,fill='#222'); yy+=18 d.rectangle((48,115,940,130),fill='#dedede') d.polygon([(75,135),(105,125),(105,132),(250,132),(250,138),(105,138),(105,145)],fill='#35495e') d.text((265,122),'pressure from inside abdomen',font=font_s,fill='#35495e') p=max(0,(step-3)/20) if p<.15: d.ellipse((80,290,245,465),fill='#f4bd67',outline='#9a5f22',width=3) else: endx=250+420*p pts=[(120,300),(200,290),(245,315),(250,350),(270,350)] for i in range(21): t=i/20; pts.append((250+(endx-250)*t,350-95*math.sin(math.pi*t))) pts += [(endx+35,377)] for i in range(20,-1,-1): t=i/20; pts.append((250+(endx-250)*t,405+95*math.sin(math.pi*t))) pts += [(270,405),(250,405),(245,440),(200,465),(120,455)] d.polygon(pts,fill='#b9e6f0',outline='#206b82') bx=max(135,endx-35); d.ellipse((bx-52,321,bx+62,433),fill='#f4bd67',outline='#9a5f22',width=3) d.arc((bx-31,345,bx+33,415),20,320,fill='#aa6d25',width=3) if step>=3: a,b,_,_=xs[2] d.line([(a-5,285),(a-5,315)],fill='#bd2e2e',width=5); d.line([(a-5,440),(a-5,470)],fill='#bd2e2e',width=5) d.text((330,245),'Weak spot in transversalis fascia\n(Hesselbach triangle)',font=font_s,fill='#9e2323'); d.line([(455,295),(a,330)],fill='#9e2323',width=2) d.text((665,150),'This is DIRECT:',font=font_b,fill='#8d2630') d.text((665,188),'• Does NOT enter deep ring',font=font_s,fill='#303846'); d.text((665,216),'• Pushes through posterior wall',font=font_s,fill='#303846'); d.text((665,244),'• Medial to inferior epigastric vessels',font=font_s,fill='#303846') if step<3: msg='1. Abdominal pressure acts outward.' elif step<10: msg='2. Peritoneum and bowel press against a weak area.' elif step<18: msg='3. They bulge through the weakened transversalis fascia.' else: msg='4. The bulge moves forward toward the superficial ring and appears in the groin.' d.rounded_rectangle((50,685,1150,735),radius=12,fill='#eaf0f6',outline='#afc2d4'); d.text((75,699),msg,font=font_s,fill='#223449') frames.append(im) frames[0].save(out,save_all=True,append_images=frames[1:],duration=[190]*23+[1200],loop=0,optimize=True) frames[-1].save('/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers_final.png') print(out) ''' open(p,'w').write(script) PY python "/tmp/workspace/inguinal-hernia-animation/src/make_gif.py" && python - <<'PY' from PIL import Image import os p='/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers.gif' im=Image.open(p) print(im.size, im.n_frames, os.path.getsize(p)) PY

Running Command

python - <<'PY' p='/tmp/workspace/inguinal-hernia-animation/src/make_gif.py' s=open(p).read() s=s.replace("font_b=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',28)\nfont=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',22)\nfont_s=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',18)\nfont_xs=ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf',16)","font_b=font=font_s=font_xs=ImageFont.load_default()") open(p,'w').write(s) PY python "/tmp/workspace/inguinal-hernia-animation/src/make_gif.py" && python - <<'PY' from PIL import Image import os p='/tmp/workspace/inguinal-hernia-animation/output/direct_inguinal_hernia_layers.gif' im=Image.open(p) print('GIF:', im.size, im.n_frames, os.path.getsize(p)) PY

Reading File

Here is an animated, simplified cross-section of a direct inguinal hernia. It shows the bowel and peritoneum pushing from inside outward through a weakened transversalis fascia in Hesselbach triangle.

direct inguinal hernia layers

GIF File · GIF

Layers, from inside the abdomen to the skin

Bowel
Parietal peritoneum: thin inner lining. It becomes the outer lining of the hernia sac.
Transversalis fascia: the key deep supporting sheet and posterior wall of the inguinal canal. In a direct hernia, this weakens.
Transversus abdominis
Internal oblique
External oblique aponeurosis
Subcutaneous fat
Skin

What the animation means

With coughing, straining, or other increases in abdominal pressure, bowel pushes against the peritoneum. If the transversalis fascia in Hesselbach triangle is weak, the peritoneum bulges forward first, carrying bowel with it.

So the bowel does not cut through the rectus abdominis. It pushes through a weak area beside the lateral edge of rectus abdominis, medial to the inferior epigastric vessels.

A direct hernia may then project toward or out of the superficial inguinal ring, but it does not start at the deep inguinal ring. The inguinal canal's anterior wall is external oblique aponeurosis and its posterior wall includes transversalis fascia. [Gray's Anatomy for Students, p. 352]

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