chapter 13 Flashcards
mechanoreceptors
pressure
thermoreceptors
temperature
photoreceptors
light
proprioceptors
position sensing, stretch
chemoreceptors
chemicals in solution
nociceptors
pain
nerves
bundles of axons in PNS
tracts
bundles of axons in CNS
mixed nerves
contains axons of motor and sensory neurons
olfactory l
sensory- smell
optic ll
sensory- vision
oculomotor lll
primarily motor- move eyeball, constrict pupil, adjust lense
trochlear lV
primarily motor- move eyeball
sensory- proprioceptors
trigeminal V
Mixed NErve
sensory- skin/muscle around the eyes, nose, mouth, cheek, tounge
Motor- chewing muscles
Abducens Vl
motor- moves the eyeball
sensory- proprioception
Facial Vll
Mixed Nerve
motor- facial expression & glans (tear,saliva)
sensory- proprioception and taste
Vestibulocochlear Vlll
Primarily sensory- hearing and balance
motor- adjust hair cells
Glossopharyngeal lX
Mixed nerve
sensory- taste and tongue sensation
motor- swallowing, speech, salivating
vagus X
Mixed Nerve
Sensory- sensations of the thorax and abdominal organs, pharynx, epiglottis
motor- swallowing, coughing, speech, contraction of GI tract, slowing HR
Accessory Xl
Primarily motor- swallowing, moving head and shoulders
sensory- proprioception
Hypoglossal Xll
primarily motor- speech, swallowing
sensory- proprioception
spinal nerves (how many are there)
8 cervical 12 thoracic 5 lumbar 5 sacral 1 coccyx
dermatome
an area of the skin the sensory nerve fiber of a particular spinal nerve innervates
cervical plexus
C1- C4
innervates the skin and muscles of the neck, head, and superior shoulders and chest
nerves on the cervical plexus
phrenic nerve
innervates diaphragm
brachial plexus
C5-C8, T1
innervates the skin and muscles of the shoulders, superior thorax and upper limbs
nerves on brachial plexus
axillary musculocutaneous median radial ulnar
ulnar nerve
innervates hand flexors and medial hand
median nerve
innervates forearm flexors and skin of anterior hand
radial nerve
innervates the tricep muscle and forearm extensors and skin of posterior hand
musculocutaneous nerve
innervates biceps, brachialis, and skin of anterior lateral forearm
axillary nerve
innervates deltoid muscle and shoulder skin
Lumbar plexus
L1-L4
innervates the skin and muscles of the anterolateral abdomen, external genitals, and part of lower limbbs
nerves of lumbar plexus
femoral- thigh flexors and leg extensors
saphenous- extends length of leg from femoral to arch of foot to hallux
sacral plexus
L4-L5, S1-S4
innervates skin and muscles of buttock and lower limbs
nerves on sacral plexus
sciatic nerve
forms tibial and fibular branches to innervate the thigh, leg, and foot
reflex activity
rapid, predicatable, involuntary unlearned motor responses to stimuli
reflex activity does
- protects body from harm
-some reflexes coordinated in brain (brain stem) and some in spinal cord
somatic and autonomic reflexes
somatic reflexes
involve skeletal muscle contractions- like jerking hand from hot stove
autonomic reflexes
not aware of- dilation of pupil
components of reflex
1- receptor (skin) 2- sensory neuron 3- integration center (interneuron) 4- motor neuron 5- effector- muscle