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_____ is a bundle of axons in the peripheral nervous system (PNS)


_______ ______ are nerves that extend from the brain

cranial nerves

how many pairs of cranial nerves are there?


what are the 3 classifications of cranial nerves?

sensory nerves, motor nerves, mixed nerves

these nerves contain only axons of sensory neurons

sensory nerves

these nerves contain only axons of motor neurons

motor nerves

these nerves contain axons of both sensory & motor neurons

mixed nerves

(I); sensations of smell from the nose; sensory nerve


(II); visual sensations from the eye; sensory nerve


(III); controls eye movement, pupillary constriction & accomodation (near vision); motor nerve


(IV); controls eye movement (downward,superior oblique); motor n.


(V); somatic sensation from face, controls chewing muscles; mixed nerve


(VI); controls eye movement (lateral rectus); motor nerve


(VII); taste sensations (anterior 2/3 of tongue) controls muscles of facial expressions (secretes saliva & tears); mixed nerve


(VIII); audition (hearing) & equilibrium (balance) from inner ear; mixed nerve


(IX); taste sensations (posterior 1/3 of tongue), input from baro/chemo receptors (secretes saliva); mixed nerve


(X); sensations from & provides motor control of many visceral organs in thoracic & abdominal cavities; mixed nerve


(XI); controls muscles that move the heand & neck; motor nerve


(XII); controls tongue movements; motor nerve


______ ______ are nerves that extend from the spinal cord

spinal nerves

spinal nerves are _____ ______ b/c they contain axons from both sensory & motor neurons

mixed nerves

how many pairs of spinal nerves are there? divided into how many groups?

31, 5

what are the 5 groups of spinal nerves?

cranial nerves, thoracic nerves, lumbar nerves, sacral nerves, coccygeal nerves

cranial nerves contain _ pairs & are located outside the ______ ____

8, spinal cord

what are the 2 distinct networks of cranial nerves?

cervical plexus, bracial plexus

________ ______ innervates the neck, posterior & lateral surface of the head, superior shoulder & diaphram

cervical plexus

how many nerves come from the cervical plexus?


______ _________ _____ innervates the scalp on posterior surface of head

lesser occipital nerve

____ __________ _____ innervates the neck (2)

ansa cervicalis nerve & transverse cervical nerve

______________ _____ innervates the superior shoulder

supraclavicular nerve

_______ _____ passes through the thoracic cavity & innervates the diaphragm (breathing)

phrenic nerve

________ ______ innervates the shoulders & upper limbs

bracial plexus

how many nerves come from the bracial plexus?


________ _____ innervates the shoulder

axillary nerve

_________________ _____ innervates the anterior arm & lateral forearm

musculocutaneous nerve

______ _____ innervates the posterior arm & posterior forearm

radial nerve

______ _____ innervates the anterior arm, anterior forearm & lateral digits

median nerve

_____ _____ innervates the medial arm, medial forearm & medial digits

ulnar nerve

________ ______ do not form a plexus, innervate to the anterior, lateral & posterior surfaces of the trunk

thoracic nerves

how many throacic nerves are there?


lumbar nerves contain _ pairs & are located outside the ______ ____

5, spinal cord

______ _______ innervates the lower abdomnial wall, external genitalia & parts of the lower limbs

lumbar plexus

how many nerves come from the lumbar plexus?


_______________ _____ innervates the lower abdominal wall

iliohypogastric nerve

what 2 nerves innervate the external genitalia?

ilioinguinal nerve & genitofemoral nerve

_______ _______ _________ _____ innervates the lateral thigh

lateral femoral cutaneous nerve

_______ _____ innervates the anterior & medial thigh & medial side of leg & foot

femoral nerve

_________ _____ innervates the medial thigh

obturator nerve

sacral nerves contain _ pairs & located outside the ______ ____

5, spinal cord

______ ______ supplies buttocks, perineum & parts of lower limb

sacral plexus

the sacral plexus gives rise to _ nerves?


what 2 nerves innervates the buttocks?

superior gluteal nerve & inferior gluteal nerve

________ _____ innervates the external genitalia & perineum

pudendal nerve

_______ _____ is the longest nerve of the body

sciatic nerve

what 2 constituents does the sciatic nerve divide into?

tibial nerve & common fibular nerve

______ _____ innervates the posterior leg & plantar surface of foot

tibial nerve

______ _______ _____ splits into 2 nerves

common fibular nerve

___________ _______ _____ innervates the lateral leg & dorsum of the foot

superficial fibular nerve

____ _______ _____ innervates the anterior leg & dorsum of the foot

deep fibular nerve

_________ ______ contain 1 pair of nerves & innervate the perineum

coccygeal nerves

_________ is an area of skin that is innervates by a particular spinal nerve


dermatomes often _______ w/ one another


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