Lab 10 Flashcards
How many spinal nerves are there in each region
Cervical: 8
Thoracic: 12
Lumbar: 5
Sacral: 5
Coccygeal: 1
4 nerve plexus
Cervical, brachial, lumbar, sacral
Know how to label all the nerves in these plexi
How many pairs of spinal nerves are there
31
Significance of conus medullaris and cauda equina
Cauda equina causes severe pain, while conus medullaris is only mild to moderate pain
How far down vertebral column does spinal cord extend
Between first and second lumbar vertebrae
Ganglia
Collection of cell bodies
Dorsal root vs dorsal root ganglion
Ganglion are where the cell bodies of neurons are and the root is where the extensions/axons are.
Why is white matter on outside and gray on inside of spinal cord
Grey matter can respond to some stimuli from neurons without transmitting information to the brain
DAVE
Dorsal Afferent, Ventral Efferent
Lesser occipital
Ventral Rami: C2, C3
Serves skin on back and side of head&neck
Greater Auricular
C2, C3
Skin of ear and over parotid gland
Transverse cutaneous
C2, C3
Skin on front and side of neck
Supraclavicular (medial, intermediate, lateral)
C3, C4
Skin on shoulder and clavicular
Ansa Cervicalis (superior and inferior roots)
C1-C3
Infrahyoid muscles of neck
Segmental branches
C1-C5
Deep muscles of neck,
Phrenic
C3-C5
Diaphragm
Axillary
C5, C6
Skin of shoulder, Deltoid and teres minor
Musculocutaneous
C5-C7
Flexor muscles of anterior arm
skin on antereolateral forearm
Median
Medial cord: C8-T1
Lateral cord C5-C7
Flexor muscles of anterior forearm
lateral palm, fingers, lateral 2/3 of hand on ventral side and dorsum fingers 2&3
Ulnar
C8, T1
Flexor muscles of anterior forearm, most intrinsic muscles of hand, skin of medial third of hand
Radial
C5-C8, T1
Posterior muscles of arm and forearm, posterior and lateral skin of entire limb
Dorsal scapular
C5
Rhomboid and levator scapulae