assignment 3 - limb innervation Flashcards
what are the 2 categories of the nervous system & what are they composed of?
central NS: brain & spinal cord
peripheral NS: cranial nerves & spinal nerves
What leave the left and right side of the spinal cord at regular intervals
spinal nerves
the spinal nerves supply _____ and _______ innervation to the muscles, skin, vessels, and joints of the limbs, neck, and body trunk
motor, sensory
A single spinal nerve consists of a combination of axons from 4 nerve types. What are they?
general somatic afferent
general somatic efferent
general visceral afferent
general visceral efferent
nerve axons conducting signals FROM skin, skeletal muscle, tendons, and joints; TO THE CNS (spinal cord)
general somatic afferent
nerve axons conducting signals FROM walls of tubular visceral organs, exocrine glands; TO THE CNS (spinal cord)
general visceral afferent
nerve axons conducting signals FROM CNS; TO voluntary striated muscle
general somatic efferent
nerve axons conducting signals FROM CNS; TO involuntary smooth muscle of organs and vessels, cardiac muscle
general visceral efferent
exits the dorsal aspect of the spinal cord
dorsal root
contains the AFFERENT nerves
dorsal root
exits the ventral aspect of the spinal cord
ventral root
contains the EFFERENT nerves
ventral root
The dorsal root and ventral root unite and form a mixed
spinal nerve
exits the vertebral column through the intervertebral foramen that exists between adjacent vertebrae
spinal nerve
The spinal nerve then splits into a ______ ______ that supplies structures dorsal to the transverse process of the vertebra and a _______ ______ that supplies structures ventral to the transverse process of the vertebra
dorsal branch, ventral branch
exits through the LATERAL VERTEBRAL FORAMEN of the ATLAS
cervical spinal nerve 1
The dorsal and ventral branches can “run with” adjacent dorsal and ventral branches, respectively
plexus
a plexus of ventral branches that supply the muscles, vessels, nerves, structures, and skin of the thoracic limb
brachial plexus
The BRACHIAL PLEXUS is formed primarily by ventral branches from spinal nerves
CS6, CS7, CS8, and TS1
relating to or affecting the skin
cutaneous
branches supplying sensory innervation from the skin to the CNS
cutaneous nerve (fibers)
cutaneous nerve branches would primarily contain
general somatic afferent (axons)
a superficial location supplied SOLELY by ONE cutaneous nerve (and one parent branch)
autonomous zone
- can help with diagnostics to test a parent nerve
the brachiocephalic nerve innervates part of what muscle distal to the shoulder?
brachiocephalicus