Sub mandibular gland Its complete anatomy , including imp landmarks and blood and nerve supply Submandibular sailadenitis , its mc cause , complications , etiology , clinical features and management Explain sub mandibular gland excision steps , post op And intera complications
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submandibular sialadenitis
This is a broad ENT and head-neck surgery topic. It can be studied in four parts:
-
Submandibular gland anatomy
- Location, parts, surfaces, relations, Wharton duct, lymph nodes
- Important surgical landmarks
- Arterial, venous, lymphatic, autonomic and sensory nerve supply
-
Submandibular sialadenitis
- Acute versus chronic disease
- Causes, including obstruction by a salivary stone, the most common cause in the submandibular gland
- Clinical features, investigations, complications and treatment
-
Submandibular gland excision
- Indications, preparation, incision, dissection planes and safe removal steps
- Protection of the marginal mandibular, lingual and hypoglossal nerves
-
Complications and postoperative care
- Intraoperative bleeding, nerve injury and duct-related issues
- Postoperative hematoma, infection, fistula, scar and follow-up care
High-level overview: The submandibular gland lies in the submandibular triangle and has superficial and deep parts wrapping around the posterior border of the mylohyoid. Its long, upward-running Wharton duct and relatively viscous saliva predispose it to stone formation. Obstruction is therefore the usual basis for recurrent submandibular swelling and sialadenitis.
During gland excision, the key operative priority is safe identification and preservation of the marginal mandibular branch of the facial nerve superiorly, and the lingual and hypoglossal nerves medially and deep to the gland. Most postoperative nerve deficits, when they occur, are temporary, but can be clinically significant.
Which section would you like in detailed exam-note format first: 1 anatomy, 2 sialadenitis, 3 excision steps, or 4 complications and postoperative care?
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Submandibular Gland: Quick Reference
1. Anatomy
Position and parts
- Largest major salivary gland after parotid.
- Located in the submandibular triangle of the neck.
- Has:
- Superficial part: below mylohyoid, in submandibular fossa.
- Deep part: hooks around posterior border of mylohyoid into floor of mouth.
Boundaries of submandibular triangle
- Superior: lower border of mandible
- Anteroinferior: anterior belly of digastric
- Posteroinferior: posterior belly of digastric and stylohyoid
- Floor: mylohyoid, hyoglossus and middle constrictor
Wharton duct
- Arises from deep part.
- Runs forward on hyoglossus and genioglossus.
- Lingual nerve loops from lateral to inferior, then medial to the duct.
- Opens at sublingual papilla beside the lingual frenulum.
Important relations and surgical landmarks
| Structure | Relation / relevance |
|---|---|
| Marginal mandibular nerve | Runs near lower mandible, superficial to facial vessels. Injury causes lower-lip weakness. |
| Facial artery | Grooves posterior/superior aspect of gland; tortuous. |
| Facial vein | More superficial and posterior than artery. |
| Lingual nerve | Superior and medial to deep lobe/duct; closely related to Wharton duct. |
| Hypoglossal nerve | Deep and inferior to lingual nerve; runs on hyoglossus. |
| Mylohyoid | Separates superficial and deep parts. |
| Submandibular ganglion | Suspended from lingual nerve; supplies parasympathetic fibers to gland. |
Blood supply
- Arterial: submental branch of facial artery, facial artery branches, lingual artery branches.
- Venous: facial vein and lingual veins.
Nerve supply
- Parasympathetic secretomotor: facial nerve via chorda tympani, joins lingual nerve, synapses in submandibular ganglion.
- Sympathetic: superior cervical ganglion via plexus around facial artery.
- Sensory: lingual nerve.
2. Submandibular Sialadenitis
Most common cause
Obstruction by sialolithiasis, a salivary stone.
Why stones are common here:
- Long and upward-running Wharton duct.
- More viscous, alkaline saliva.
- Higher calcium and phosphate content.
Etiology
- Sialolithiasis/duct obstruction
- Ascending bacterial infection, commonly oral flora including Staphylococcus aureus
- Dehydration, poor oral intake, postoperative state
- Reduced salivary flow: anticholinergic drugs, Sjögren syndrome, radiotherapy
- Duct stricture or external compression
- Recurrent/chronic inflammatory disease
Clinical features
- Painful unilateral submandibular swelling
- Pain and swelling increase during meals
- Tender, firm gland
- Fever, malaise and erythema in acute bacterial infection
- Pus may be expressed from Wharton duct
- Stone may be palpable in floor of mouth
- Chronic disease: recurrent postprandial swelling, fibrosis and reduced salivary flow
Investigations
- Examine floor of mouth and milk Wharton duct.
- Ultrasound: first-line test for most stones.
- CT: useful for radiopaque stones, abscess, deep infection.
- Culture purulent duct discharge when present.
- Consider autoimmune testing if bilateral recurrent disease with dry eyes/mouth.
Management
Uncomplicated acute sialadenitis
- Hydration
- Sialogogues: lemon drops/acidic foods if appropriate
- Gland massage, warm compresses
- Analgesia
- Improve oral hygiene
- Antibiotics when bacterial infection is suspected, selected according to local antimicrobial guidance and patient factors
Obstructing stone
- Small distal stone: transoral duct incision/sialolithotomy where appropriate
- Sialendoscopy with stone retrieval or fragmentation
- Combined endoscopic-transoral procedure for selected stones
- Gland excision for recurrent disease, inaccessible intraglandular stones, severe chronic gland damage, or suspected tumour
Complications
- Abscess formation
- Cellulitis of neck/floor of mouth
- Spread to submandibular, sublingual or parapharyngeal spaces
- Ludwig angina and airway compromise
- Sepsis
- Chronic sialadenitis, gland fibrosis and atrophy
- Salivary fistula, rarely
3. Submandibular Gland Excision
Common indications
- Recurrent obstructive sialadenitis or recurrent stones
- Chronic sclerosing sialadenitis
- Intraglandular stones unsuitable for conservative removal
- Benign or malignant salivary gland tumour
- Persistent infection/abscess not responding to drainage and medical treatment
Key operative steps
- General anaesthesia; patient supine with neck extended and head turned opposite side.
- Palpate mandible and mark an incision about 2 cm below the lower border of mandible, usually in a skin crease.
- Incise skin, subcutaneous tissue and platysma.
- Raise subplatysmal flaps carefully.
- Protect the marginal mandibular nerve:
- Avoid excessive superior flap traction.
- Stay in a safe plane deep to platysma and superficial to gland/facial vessels as appropriate.
- Identify and control facial vein and facial artery branches as needed.
- Mobilize superficial lobe from capsule and surrounding tissues.
- Retract/release posterior border of mylohyoid to expose deep lobe.
- Identify and preserve:
- Lingual nerve superiorly
- Hypoglossal nerve inferiorly on hyoglossus
- Ligate/divide Wharton duct close to gland after confirming nerve safety.
- Remove gland, secure hemostasis and inspect wound.
- Insert suction drain if indicated.
- Layered closure of platysma and skin.
4. Intraoperative Complications
| Complication | Prevention / significance |
|---|---|
| Marginal mandibular nerve injury | Causes lower-lip asymmetry, weak depression of lower lip. Protect nerve with careful flap elevation and traction. |
| Lingual nerve injury | Ipsilateral tongue numbness, altered taste, possible dysesthesia. |
| Hypoglossal nerve injury | Tongue weakness; tongue deviates toward injured side on protrusion. |
| Facial artery/vein bleeding | Careful identification, ligation and hemostasis. |
| Submental or lingual vessel bleeding | May cause hematoma. |
| Duct injury or inadequate duct control | Risk of salivary leak/fistula. |
| Injury to adjacent floor-of-mouth structures | Avoid deep blind dissection. |
| Tumour spillage/inadequate margins | Important if malignancy is suspected. |
5. Postoperative Care
- Monitor airway, neck swelling and drain output.
- Check for hematoma, especially during first 12-24 hours.
- Analgesia and antiemetics as required.
- Antibiotics only when clinically indicated or prescribed for infected cases.
- Encourage oral fluids and diet as tolerated.
- Wound care: keep clean and dry; follow local advice for showering and dressings.
- Drain is commonly removed when output is low, often next day.
- Review approximately 1 week after surgery; remove nonabsorbable sutures if used.
- Assess lower-lip movement, tongue sensation, tongue movement and wound healing.
Seek urgent review for
- Rapidly increasing neck swelling
- Breathing difficulty or dysphagia
- Significant bleeding
- Fever, pus, worsening pain or redness
- Persistent salivary leak
- New tongue weakness or persistent lower-lip asymmetry
Evidence note: A recent 2026 systematic review on endoscope-assisted and robot-assisted submandibular sialadenectomy reported comparative surgical outcomes, but conventional transcervical excision remains a standard approach in many settings (Zhou et al., 2026).
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