Lecture 39 - Innervation of the Limbs Flashcards
what does the brachial plexus include
C6 - T2 (ventral branches)
what innervates:
supraspinatus and infraspinatus
suprascapular n.
what innervates:
subscapularis
subscapular n.
what innervates:
deltoideus, teres major, teres minor
axillary n.
what innervates:
biceps brachii
brachialis
musculocutaneous n.
what arises from the musculocutaneous n.? What is the function?
medial cutaneous antebrachial n.; sensory
what innervates:
triceps brachii, tensor fascia antebrachii
radial n
why is the radial nerve particularly important
if the radial nerve is nonfunctional then the triceps is non-functioning = no elbow extension = can’t bear weight on limb
if the radial nerve terminates deep then its function is:
motor
if the radial nerve terminates superficially then its function is:
sensory
what two nerves arise from a common trunk in the antebrachium
median and ulnar nerve
T/F: the median nerve passes through the supracondylar foramen in cats
TRUE
what does the lumbosacral plexus include
L4 - S3
what are the 4 major branches of the lumbosacral plexus
- femoral nerve
- cranial gluteal nerve
- caudal gluteal nerve
- sciatic nerve
what is innervated by the caudal gluteal n.
superficial gluteal
what is innervated by the cranial gluteal n.
middle and deep gluteal m. and tensor fascia latae
what nerve is all about stifle extension? what muscles does it innervate?
femoral nerve; quadriceps femoris, sartorius, iliopsoas
what arises from the femoral nerve? what is its function?
saphenous n; sensory
what is innervated by the sciatic nerve?
internal obturator
quadratus femoris
gemelli
biceps femoris
semitendinosus
semimembranosus
what two branches does the sciatic nerve terminate in
- tibial n.
- common fibular n.
what 3 sites should IM injections be given in to avoid major nerves
- epaxial
- quadriceps femoris
- semimembranosus and semitendinosus
what nerve innervates the caudal crus m. (gastrocnemius, extensors of tarsus)
tibial n.
what nerve innervates the cranial crus m. (cranial tibial m., flexors of tarsus)
common fibular
T/F: areas of sensory innervation are supplied by at least two nerves
FALSE - only one
what 5 nerves in the pelvic limb have autonomous zones
- sciatic
- common fibular
- tibial
- saphenous
- caudal cutaneous femoral
what is the AZ of the caudal cutaneous femoral n.
caudolateral proximal thigh; branches of S1/2
what is the AZ of the saphenous n.
medial crus and tarsus
what is the AZ of the tibial and common fibular n.
plantar and dorsal pes respectively
what is the AZ of the sciatic n.
caudal curs, common fibular, and tibial n.
what 3 nerves in the thoracic limb have autonomous zones
- radial
- ulnar
- musculocutaneous
what are the divisions of the radial nerve
lateral cutaneous antebrachial
medial and lateral branches
what are the divisions of the ulnar nerve
caudal cutaneous antebrachial
dorsal ulnar branch
what is different about the palmar nerves in cats compared to dogs
the branches of the ulnar and median n. do not anastomose
there is an AZ for the median n. on digits I-III
