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C4 and C5 are the areas that see the highest amount of cervical spine trauma. [ 8 ] If it does occur, however, it may cause death or profound disability, including paralysis of the arms, legs, and diaphragm , which leads to respiratory failure .
The posterior division of the third cervical is intermediate in size between those of the second and fourth. Its medial branch runs between the Semispinalis capitis and cervicis, and, piercing the Splenius and Trapezius, ends in the skin.
Phrenic (C3-C5, but mostly C4) - innervates thoracic diaphragm and the pericardium. Segmental branches (C1-C4) - innervate anterior and middle scalene muscles; Levator scapulae muscle (C3-C4) (also innervated by dorsal scapular nerve (C5) of the brachial plexus)
The cervical spinal nerve 5 (C5) is a spinal nerve of the cervical segment. [1]It originates from the spinal column from above the cervical vertebra 5 (C5). It contributes to the phrenic nerve, long thoracic nerve, and dorsal scapular nerve before joining cervical spinal nerve 6 to form the upper trunk, a trunk of the brachial plexus, which then forms the lateral cord, and finally the ...
In humans myotome testing can be an integral part of neurological examination as each nerve root coming from the spinal cord supplies a specific group of muscles. Testing of myotomes, in the form of isometric resisted muscle testing, provides the clinician with information about the level in the spine where a lesion may be present. [ 7 ]
Cervical spinal nerve 4, also called C4, is a spinal nerve of the cervical segment. It originates from the spinal cord above the 4th cervical vertebra (C4). It contributes nerve fibers to the phrenic nerve , the motor nerve to the thoracoabdominal diaphragm .
C3, C4, C5: Supply diaphragm (mostly C4) C5, C6: Move shoulder, raise arm ; flex elbow C6: externally rotate the arm C6, C7: Extend elbow and wrist (triceps and wrist extensors); pronate wrist C7, T1: Flex wrist; supply small muscles of the hand: T1–T6: Intercostals and trunk above the waist: T7–L1: Abdominal muscles L1–L4: Flex thigh
Within the cervical spine, most joints are innervated by the medial branch nerve (a branch of the dorsal rami) from the same levels. In other words, the facet joint between C4 and C5 vertebral segments is innervated by the C4 and C5 medial branch nerves. However, there are two exceptions:
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