Explain me about veterbral coloumn from greys anatomy with images

Reading File

Finding Sources

Reading File

Loading Image

Reading File

Loading Image

Reading File

Loading Image

I now have all the images and content needed for a comprehensive answer. Let me compile the full explanation from Gray's Anatomy for Students.

The Vertebral Column - Gray's Anatomy for Students

Overview

The vertebral column is the central axis of the skeleton. It contains approximately 33 vertebrae subdivided into five regions based on morphology and location:

Region	Number of Vertebrae	Key Features
Cervical (C1-C7)	7	Smallest; foramen transversarium in each transverse process
Thoracic (T1-T12)	12	Articulate with ribs; costal facets
Lumbar (L1-L5)	5	Largest; no rib facets; large transverse processes
Sacral	5 (fused = sacrum)	Triangular; articulates with pelvic bones
Coccygeal	3-4 (fused = coccyx)	Small triangular bone; no vertebral canal

Functions by Region

Cervical - supports and moves the head; transmits spinal cord and vertebral arteries between head and neck
Thoracic - support for thorax
Lumbar - support for abdomen
Sacral - transmits weight to lower limbs through pelvic bones; framework for posterior pelvis

A Typical Vertebra

A typical vertebra has two main parts: a vertebral body (anterior) and a vertebral arch (posterior).

Fig. 2.6 - A Typical Vertebra. (A) Superior view. (B) Lateral view.

Key components:

Vertebral body - anterior; major weight-bearing component; increases in size from CII to LV; separated from adjacent vertebrae by fibrocartilaginous intervertebral discs
Pedicles - two lateral pillars anchoring the arch to the body
Laminae - form the roof of the arch; fuse at midline
Spinous process - projects posteriorly and inferiorly from the arch roof
Transverse processes - extend laterally from where lamina meets pedicle; serve as muscle/ligament attachment points
Superior and inferior articular processes - articulate with adjacent vertebrae
Fused costal (rib) elements - incorporated into transverse processes in non-thoracic regions

The vertebral canal runs from C1 to S5, formed by the alignment of all vertebral arches, and houses the spinal cord with its membranes, vessels, and proximal spinal nerve roots.

Vertebral Canal, Spinal Cord and Spinal Nerves

During development, the vertebral column grows faster than the spinal cord, so the spinal cord ends at the LI-LII level in adults (can range from TXII to the LII-LIII disc). Spinal nerves below this level travel obliquely downward as the cauda equina.

Fig. 2.11 - Vertebral Canal, Spinal Cord, and Spinal Nerves showing all 31 pairs of spinal nerves, the cervical and lumbosacral enlargements, the cauda equina, and the end of the subarachnoid space at SII.

Regional Vertebrae

Cervical Vertebrae (C1-C7)

Fig. 2.15 - Radiograph of Cervical Region. (A) AP view. (B) Lateral view showing C1 (atlas), vertebra prominens (CVII), and intervertebral disc locations.

A typical cervical vertebra (C3-C6) has:

Short, bifid spinous process
Square-shaped vertebral body with concave superior and convex inferior surfaces
Trough-shaped transverse process perforated by a foramen transversarium (transmits vertebral artery, vein, and sympathetic nerves)
Triangular vertebral foramen
Uncinate processes on the superior lateral surface (unique to cervical)

Fig. 2.20A - Typical cervical vertebra (superior and anterior views) showing foramen transversarium, uncinate process, and triangular vertebral canal.

The Atlas (C1) and Axis (C2)

These are specialized for head movement:

Atlas (CI) - has no vertebral body (it fused with C2's body during development to form the dens/odontoid process); no intervertebral disc between CI and CII; ring-shaped with anterior and posterior arches and two lateral masses; has facets for the occipital condyles (atlanto-occipital joint = nodding "yes")
Axis (CII) - distinguished by the dens (odontoid process) projecting superiorly; held against anterior arch of atlas by the transverse ligament; atlanto-axial joint allows rotation ("no" movement)

Fig. 2.20B Atlas, Axis and their ligaments

Fig. 2.20B - Atlas and axis with their ligaments: transverse ligament of atlas, alar ligaments, apical ligament of dens, and tectorial membrane (upper part of posterior longitudinal ligament).

Thoracic Vertebrae (T1-T12)

All 12 thoracic vertebrae are characterized by articulation with ribs:

Superior and inferior costal (demi)facets on the vertebral body for rib head articulation
Transverse costal facets on the transverse process for rib tubercle articulation
Heart-shaped vertebral body (superior view)
Circular vertebral foramen
Long, inferiorly directed spinous processes

Fig. 2.16 Thoracic Region Radiograph + Thoracic/Lumbar Vertebrae

Fig. 2.16 - Radiograph of Thoracic and Lumbar regions showing pedicles, vertebral bodies, ribs, transverse processes, spinous processes, and intervertebral foramina.

Lumbar Vertebrae (L1-L5)

Largest vertebrae in the column
No costal facets (no rib articulation)
Cylindrical vertebral body; triangular vertebral foramen (larger than thoracic)
Thin, long transverse processes (except LV - massive, cone-shaped for iliolumbar ligaments)
Mammillary processes on the superior articular processes

Sacrum

Five fused sacral vertebrae form a single triangular bone:

Apex pointed inferiorly; concave anterior and convex posterior surfaces
Articulates superiorly with LV and inferiorly with the coccyx
Two large L-shaped facets laterally for sacroiliac joints (articulation with pelvic bones)
4 pairs of anterior sacral foramina (anterior rami of S1-S4)
4 pairs of posterior sacral foramina (posterior rami of S1-S4)

Fig. 2.20E,F - Sacrum (anterior and dorsolateral views) and Coccyx (posterior view). Note the anterior/posterior sacral foramina, facet for pelvic bone, and incomplete sacral canal.

Coccyx

Small triangular bone; 3-4 fused coccygeal vertebrae
No vertebral arches, therefore no vertebral canal
Characterized by coccygeal cornua

Intervertebral Foramina

Each intervertebral foramen is formed by:

Above: inferior vertebral notch on the pedicle of the superior vertebra
Below: superior vertebral notch on the pedicle of the inferior vertebra
Anteriorly: the vertebral body and intervertebral disc
Posteriorly: the zygapophysial joint

These foramina transmit spinal nerves and blood vessels. In the lumbar region, large gaps also exist between adjacent laminae and spinous processes - these widen further during flexion, providing access for procedures like lumbar puncture and epidural anesthesia.

Joints of the Vertebral Column

Each vertebra has 6 joints with adjacent vertebrae:

2 symphyses (one above, one below) via intervertebral discs
4 synovial joints (two superior and two inferior zygapophysial joints)

Intervertebral Discs (Symphyses)

Fig. 2.31 Intervertebral Joint - Intervertebral Disc

Fig. 2.31 - Intervertebral joint showing the layer of hyaline cartilage covering the vertebral body.

Each disc consists of:

Annulus fibrosus - outer ring of collagen + wider zone of fibrocartilage in a lamellar arrangement; limits rotation
Nucleus pulposus - central gel-like core; remnant of the embryological notochord; acts as a shock absorber

A layer of hyaline cartilage separates the disc from the vertebral body on each side.

Zygapophysial (Facet) Joints

Synovial joints between the articular processes of adjacent vertebrae. Their orientation varies by region and determines the type of movement possible:

Cervical: oblique facets - allow flexion, extension, lateral flexion, and rotation
Thoracic: near-coronal orientation - limit flexion/extension but permit some rotation
Lumbar: near-sagittal orientation - permit flexion/extension; limit rotation

Curvatures of the Vertebral Column

The vertebral column has four curvatures in the sagittal plane:

Curvature	Region	Direction	Type
Cervical lordosis	Cervical	Convex anteriorly	Secondary (develops when infant holds head up)
Thoracic kyphosis	Thoracic	Convex posteriorly	Primary (fetal position)
Lumbar lordosis	Lumbar	Convex anteriorly	Secondary (develops when infant stands)
Sacral kyphosis	Sacral	Convex posteriorly	Primary (fetal position)

Clinical deformities:

Scoliosis - abnormal lateral curvature with a rotational component; commonest type is idiopathic; can also be congenital or secondary to muscular dystrophy, tumors, or disc protrusion
Kyphosis - abnormal thoracic posterior curvature ("hunchback"); classic cause is tuberculosis producing a gibbus deformity
Lordosis - exaggerated anterior lumbar curve; often associated with pregnancy or obesity

Clinical Notes from Gray's Anatomy for Students

Spina bifida - failure of vertebral arch fusion, usually in lower vertebrae. Two types:

Spina bifida occulta - posterior arch defect at LV or SI (up to 10% of population); often asymptomatic, may show a tuft of hair over the spinous processes
Severe spina bifida - complete failure of posterior arch fusion with outpouching: meningocele (CSF only) or myelomeningocele (contains spinal cord tissue); can cause neurological deficits including impaired walking and bladder dysfunction

Vertebroplasty - injection of bone cement (methyl methacrylate) into a collapsed vertebral body; most commonly used for osteoporotic wedge fractures

Osteoporosis and vertebral fractures - wedge fractures commonly occur at L1 in osteoporotic patients; DXA scanning identifies at-risk patients

Disc herniation - the nucleus pulposus can herniate through the annulus fibrosus posterolaterally, compressing adjacent nerve roots and causing radiculopathy

Source: Gray's Anatomy for Students (ISBN 9780323934237), Chapter 2 - Back

This is a shared conversation. Sign in to Orris to start your own chat.