Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Back Sheet
21 rows · AnatoMemory · sample of the first 1 row of each section (6 of 21)
Muscles
Muscles - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Muscle
Origin
Insertion
Action
Innervation
Blood supply
Erector spinae
Shared lower aponeurosis attached to the posterior pelvis and sacrum, with additional vertebral and rib origins in regional parts
Ribs and vertebral processes at higher levels; some upper portions reach the skull
Extends and laterally bends the trunk and neck; helps maintain posture and control flexion
Segmental branches of posterior, or dorsal, spinal nerve rami
Regional branches including deep cervical, posterior intercostal, subcostal and lumbar arteries
Bones
Bones - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Bone
Bone type
Key landmarks
Articulations
Atlas (C1)
Irregular bone of the cervical spine
Anterior and posterior arches; paired lateral masses; transverse foramina; articular surface for the dens behind the anterior arch
Occipital condyles above; the axis below and at the dens
Nerves
Nerves - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Nerve
Root value
Course
Motor
Sensory
Cauda equina
Usually described as L2–L5, S1–S5 and Co1 roots; descriptions of its uppermost lumbar extent vary
Descend beside the filum terminale in the lumbar cistern before reaching their corresponding exits from the vertebral canal
Somatic fibers to lower-limb and perineal muscles, including external sphincters; sacral roots also carry parasympathetic output to pelvic organs
Sensory input from the lower limbs and perineal region, with the affected area depending on which roots are involved
Organs
Organs - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Organ
Location
Parts
Relations
Blood supply
Innervation
Venous/Lymphatic drainage
Function
Conus medullaris 2,3
Lower end of the spinal cord in the upper lumbar vertebral region in most adults; vertebral position is variable
Mainly the lowest sacral and coccygeal cord segments, commonly described as S2–S5 and Co1; the lumbar enlargement lies higher
Adjacent to descending cauda equina roots within the meningeal sac; continuous inferiorly with the filum terminale
Anterior and posterior spinal arterial branches connect around the conus in an arterial basket; segmental arterial reinforcement contributes to the lower cord supply
not recorded
not recorded
Contains sacral sensory, somatic motor and autonomic circuits important for the perineum, pelvic viscera and sphincter control
Ligaments
Ligaments - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Ligament
Attachments
Function
Clinical point
Denticulate ligaments
Pial bands on the lateral cord surfaces connect to dura through triangular extensions passing across the subarachnoid space
Help restrain cord displacement while permitting movement; the amount and direction of restraint vary by spinal region
Useful for orientation between dorsal and ventral roots during intradural surgery; their presence does not make the cord immobile
Spaces
Spaces - Back Sheet. Every structure of the back on one sheet - the vertebral column, the intrinsic back muscles, and the spinal nerves and meninges, each type in its own table.
Space
Boundaries
Contents
Communications
Lumbar cistern
Extends from below the conus, usually around L1–L2, to the end of the arachnoid-lined dural sac near S2; these are approximate adult vertebral levels
Cerebrospinal fluid, descending cauda equina roots and the filum terminale internum
Continuous upward with the spinal and cranial subarachnoid space; arachnoid and dura separate it from the epidural space
Built from the back records of the AnatoMemory reference library.
No "Root value" value is recorded for this structure in the reference data.
No "Innervation" value is recorded for this structure in the reference data.
No "Venous/Lymphatic drainage" value is recorded for this structure in the reference data.
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