Deck 28: Spinal Reflexes

Question 1

The only monosynaptic reflex is the

A) W ithdrawal reflex
B) Crossed-extensor reflex
C) Myotatic reflex
D) Inverse myotatic reflex
E) Direct pupillary reflex

Answer 1

C

Question 2

Sensory input for the withdrawal reflex is provided by

A) pa in rec ep tors in th e sk in
B) Golgi tendon organ
C) Merkel's disks
D) Pacinian corpuscles
E) muscle spindles

Answer 2

A

Question 3

Alpha motor neurons are located in the

A) Premotor cortex
B) Pre-central gyrus
C) Post-central gyrus
D) Ven tral ho rn of th e sp inal co rd
E) Dorsa l horn of the spinal cord

Answer 3

D

Question 4

The "final common pathway" for control of muscle is the

A) Alpha motor neuron
B) Upper motor neurons in the cortex
C) Lateral corticospinal tract
D) Pyramidal tract
E) Rubrospinal tract

Question 5

Tapping on the patellar ligament causes

A) R ef lex co ntr ac tion of t he ga str oc ne m ius m us cle
B) R ef lex co ntr ac tion of t he so leu s m us cle
C) R ef lex inh ibitio n o f th e g as tro cn em ius m us le
D) Re flex c on trac tion of th e qu ad ricep s m us cle
E) R ef lex inh ibitio n o f th e q ua dr ice ps m us cle

Question 6

The sensory input for the crossed extensor reflex originates from

A) Pa in rec ep tors in th e co ntra latera l skin
B) Contralateral Golgi tendon organ
C) Ipsilateral Merkel's disks
D) Pacinian corpuscles
E) Ipsilateral muscle spindles

Question 7

Afferent sensory information for the withdrawal reflex

A) Enters the spinal cord via the ventral root of the spinal nerve
B) Enters the spinal cord via the grey rami comm unicans
C) Exits the spinal cord via the white rami comm unicans
D) Ex its v ia th e s ym pa the tic c ha in
E) Enters the spinal cord via the dorsal root of the spinal nerve

Question 8

The Ia primary afferents from m uscle spindles carry information mainly about the

A) Ra te o f stre tch of th e m us cle
B) Sta tic s tre tch of m us cle
C) Pa ss ive ten sio n o f th e m us cle
D) Ac tive ten sio n o f th e m us cle
E) Stretch of the tendon

Question 9

Sensory input for the myotatic reflex is provided by

A) pa in re ce pto rs in th e s kin
B) Golgi tendon organ
C) Merkel's disks
D) Pacinian corpuscles
E) muscle spindles

Question 10

Which of the following is NOT characteristic of a reflex?

A) It is "hard-wired" - it does not require training
B) It is stereotypical - it always occurs in the same way
C) It can be voluntarily suppressed
D) It is a reflection of the nervous system onto the m usculature
E) It is th e m os t ra pid of n er vo us res po ns es to e nv iro nm en tal s tim uli

Question 11

The m uscle spindle

A) Uses annulospiral rings to sense stretch
B) Ca rries s ens ory infor m ation o ver th e ga m m a aff eren ts
C) Uses the Golgi tendon organ to sense muscle tension
D) Has afferents that travel up the dorsal columns
E) Both A and C

Question 12

The pu rpos e of th e ga m m a eff eren t m otor s ystem is to

A) override the inverse myotatic reflex
B) tak e o ve r w he n a lph a m oto r ne ur on s f ail
C) maintain muscle spindle sensitivity during contractions
D) inh ibit m us cle pa in
E) prevent muscle spasm

Question 13

Which of the following is NOT a spinal reflex?

A) The withdrawal reflex
B) The m yotatic reflex
C) The blink reflex
D) The inverse myotatic reflex
E) The crossed-extensor reflex

Question 14

The m otor comm and for the withdraw reflex

A) Exits the spinal cord via the ventral root of the spinal nerve
B) Enters the spinal cord via the grey rami comm unicans
C) Exits the spinal cord via the white rami comm unicans
D) Ex its v ia th e s ym pa the tic c ha in
E) Enters the spinal cord via the dorsal root of the spinal nerve