Spinal Anatomy Lab Practical 1 Muscle AN's

Trapezius action and innervation

elevates scapula, spinal accessory nerve (CN XI)

Latissimus Dorsi action and innervation

extend/flex lumbar spine

and downward rotation, depression, and adduction of scapula; thoracodorsal nerve

Levator Scapulae action and innervation

elevates scapula; dorsal scapular nerve

Rhomboid Major action and innervation

retract scapula; dorsal scapular nerve

Rhomboid Minor action and innervation

retract scapula, dorsal scapular nerve

Splenius Capitis action and innervation

laterally flexes neck; dorsal primary rami of C2-C6

Splenius Cervicis action and innervation

laterally flexes neck; dorsal primary rami of C5-C8

Serratus Posterior Superior action and innervation

elevate upper 5 ribs during inspiration; intercostal nerves

Serratus Posterior Inferior action and innervation

Draws lower 4 ribs inf. & post. for expiration; intercostal nerves T9-T12

Iliocostalis Lumborum action and innervation

Extension & Lateral flexion of trunk; dorsal primary rami of T7-L3

Iliocostalis Thoracis action and innervation

extension of thoracic spine; dorsal rami of T1-T6

Iliocostalis Cervicis action and innervation

extension of lower cervical spine; dorsal rami of lower cervical and upper thoracic spinal nerves

Longissimus Thoracis action and innervation

lateral flexion of trunk; dorsal rami of thoracic spinal nerves

Longissimus Cervicis action and innervation

lateral flexion of neck; dorsal rami of C4- T2 spinal nerves

Longissimus Capitis action and innervation

lateral flexion of neck; dorsal rami of C1-C3 spinal nerves

Spinalis Thoracis action and innervation

extend thoracic spine; dorsal rami of thoracic and upper lumbar spinal nerves

Spinalis Cervicis action and innervation

lateral flexion of neck; dorsal rami of lower cervical and upper thoracic spinal nerves

Spinalis Capitis action and innervation

lateral flexion of head; dorsal rami of lower cervical and upper thoracic spinal nerves

Semispinalis Thoracis action and innervation

lateral flexion of thoracic spine and ribs; dorsal rami of thoracic and lumbar spinal nerves

Semispinalis Cervicis action and innervation

Extends & Rotates Neck; Dorsal rami of lower cervical and upperthoracic spinal nerves

Semispinalis Capitis action and innervation

Extends & Rotates head; Greater Occipital Nerve & 3rd Spinal Nerve

Multifidus action and innervation

Extends Neck & Trunk; Dorsal rami of cervical, thoracic, and lumbarspinal nerves

Rotator Brevis action and innervation

Extends & Rotates Trunk; dorsal rami of spinal nerves at segmental level

Rotator Longus action and innevation

Rotate & Extends Trunk; dorsal rami of spinal nerves at segment level

Rectus Capitis Posterior Major action and innervation

Rotates & Extends Neck; subocciptial nerve

Rectus Capitis Posterior Minor action and innervation

extends head; subocciptal nerve

Obliquus Capitis Inferior action and innervation

Rotates head; subocciptal nerve

Obliquus Capitis Superior action and innervation

lateral flexion & extension of head; subocciptal nerve

Interspinalis action and innervation

extends neck & trunk; dorsal rami of cervical, thoracic, lumbar spinal nerves

Longus Colli action and innervation

lateral flexion & rotation of neck; ventral rami C2-C6 spinal nerves

Longus Capitis action and innervation

flex head; ventral rami of C1-C3 spinal nerves

Rectus Capitis Anterior action and innervation

laterally flexes head; ventral rami of C1-C2 spinal nerves

Rectus Capitis Lateralis action and innervation

laterally flex head; ventral rami of C1-C2 spinal nerves

Quadratus Lumborum action and innervation

Extends and Laterally Flexes Trunk; ventral rami T12-L4 spinal nerves

Levator Costarum Longus/Brevis action and innervation

elevate ribs; dorsal rami of thoracic spinal nerves