Neuroanatomy of the Trunk and Upper Body Flashcards
where does the spinal cord extend from?
foramen magnum to ~ the level of the disc between vertebrae L1 and L2
what is the distal end of the spinal corn called?
Conus medullaris
true or false: spinal nerves contain only sensory neurons
FALSE: spinal nerves contain both sensory and motor neurons
what is it called when nerves contain both sensory and motor neurons
mixed nerve
what are the spinal nerves found in the thorax called
intercostal nerves
where in the ribs do the intercostal nerves run
run in inferior groove of ribs
what do the intercostal nerves supply motor innervation to?
intercostal and abdominal muscles
what do the intercostal nerves supply sensory innervation to?
the skin of thoracic and abdominal wall
nerves above and below the thorax tend to form ____
plexuses
what plexuses are formed by the lower limb?
lumbar and sacral plexuses
what plexus is formed by the upper limb?
brachial plexus
what plexus is formed by the neck?
cervical plexus
what spinal cord segments does the cervical plexus cover?
C1-C4
the cervical plexus sits ____ to sternocleidomastoid
deep
what does the cervical plexus supply to?
supplies skin and muscles of neck
what is the most important nerve of the cervical plexus? why?
phrenic nerve – provides sensory and motor innervation to the diaphragm
what spinal cord segments does the brachial plexus cover?
C5, C6, C7, C8, T1
where does the brachial plexus emerge and run ?
between the anterior and middle scalene muscles, run over rib , under the middle third of the clavicle and then into the axilla
what are the 5 terminal branches from the brachial plexus?
1) musculocutaneous nerve
2) Median nerve
3) Ulnar Nerve
4) Radial Nerve
5) Axillary Nerve
where does the musculocutaneous nerve supply?
supplies anterior brachium muscles
what is another name for the median nerve
the “flexor” nerve
where does the median nerve supply?
supplies forearm flexors
where does the ulnar nerve supply?
supplies flexor carpi ulnaris, 1/2 flexor digitorum profundus and most intrinsic muscles of the hand
where is the median nerve found
behind the medial epicondyle of the humerus
what is another name for the radial nerve
the “extensor” nerve
where does the radial nerve supply?
supplies posterior upper limb
where does the axillary nerve supply
supplies teres minor and deltoid, as well as skin over deltoid
when is the axillary nerve damaged
when GH joint is dislocated
