Lecture #10-12 Muscular System Flashcards
A 24-year-old man is unable to flex his right forearm at the elbow joint. Which of the following best describes the nerve likely affected in this case?
A. Radial
B. Ulnar
C. Musculocutaneous
D. Axillary E. Median
C. Musculocutaneous
A patient can abduct her arm no further than the 15 degree position . Which of the following muscles is most likely affected?
A. Rhomboid minor
B. Teres minor
C. Deltoid
D. Supraspinatus
E. Subscapularis
C. Deltoid
Which of the following actions would you ask a patient to perform in order to test the function of the trapezius muscle?
A. Push against a wall with both hands
B. Adduct the arm against resistance
C. Abduct the arm fully
D. Shrug the shoulder
E. Flex the arm fully
D. Shrug the shoulder
Which of the following statements about the gastronemius muscle is correct?
A. Innervated by the deep fibular nerve.
B. Dorsiflexion of the ankle joint.
C. Found in the lateral compartment of the leg.
D. Plantar flexion of the ankle joint.
E. Insertion to the foot via the pattelar tendon.
D. Plantar flexion of the ankle joint.
Which of following best describes the muscle that everts the foot?
A. Tibialis anterior
B. Flexor hallucis longus
C. Fibularis longus
D. Tibialis posterior
E. Flexor digitorium longus
C. Fibularis longus
Which of the following best describes the connective tissue covering a muscle fascicle?
A. Perichondrium
B. Perimysium
C. Endosteum
D. Epimysium
E. Endomysium
B. Perimysium
Which of the following muscles is not part of the rotator cuff group?
A. Teres major
B. Infraspinatus
C. Teres minor
D. Supraspinatus
E. Subscapularis
A. Teres major
An 23-year-old woman is asked to abduct the lower limb against the resistance provided by the physician. Which of the following muscles is tested in this exercise?
A. Pectineus
B. Gracilis
C. Semimembranosus
D. Semitendinosus
E. Gluteus medius
E. Gluteus medius
Which of the following best describes the muscle that closes and protrudes the lips?
A. Mentalis
B. Depressor anguli oris
C. Orbicularis oculi
D. Levator labii superioris
E. Orbicularis oris
E. Orbicularis oris
A 24-year-old woman is diagnosed with a laceration to the median nerve at the wrist. Which of the following best describes the muscles most likely affected in this condition?
A. Thenar
B. Dorsal interossei
C. Extensor pollicis longus
D. Hypothenar
E. Palmar interossei
A. Thenar
1) A skeletal muscle is composed of a number of ________, each composed of many muscle fibers bundled by connective tissue.
A) fascicles
B) myofibrils
C) muscle cells
D) myofilaments
E) sarcomeres
A) fascicles
What structure composed of connective tissue transmits force from contracting skeletal muscle to bone?
A) myofibril
B) fascicle
C) tendon
D) ligament
E) aponeurosis
C) tendon
What is the saclike membranous network that surrounds each myofibril called?
A) sarcolemma
B) sarcoplasmic reticulum
C) transverse tubule
D) nucleus
E) mitochondrion
B) sarcoplasmic reticulum
The fundamental repeating unit of the myofibril called a ________ gives skeletal muscle its striated appearance, and is bordered by ________. (**Physio Question)
A) crossbridge : Z lines
B) sarcomere : M lines
C) sarcomere : I bands
D) sarcomere : Z lines
E) crossbridge : A bands
D) sarcomere : Z lines
Which of the following muscles that act on the thumb is not located in the thenar eminence?
a. abductor pollicis brevis
b. flexor pollicis brevis
c. opponens pollicis
d. flexor pollicis longus
e. Two of the above
d. flexor pollicis longus
The thenar muscles act on:
a. the wrist.
b. the thumb.
c. the little finger.
d. all fingers except the thumb.
e. the great toe.
b. the thumb.
During exhalation, the diaphragm:
a. contracts and flattens.
b. relaxes and flattens.
c. contracts and forms a dome.
d. relaxes and forms a dome.
e. does not contract or relax.
d. relaxes and forms a dome.
The action of the pectoralis major muscle is to:
a. abduct the arm and rotate the arm laterally.
b. flex, adduct, and rotate the arm medially.
c. adduct the arm and rotate the arm laterally.
d. abduct the arm and rotate the arm medially.
e. abduct and raise the arm.
b. flex, adduct, and rotate the arm medially.
Which of the following is part of the medial compartment of muscles that act on the femur?
a. semitendinosus
b. biceps femoris
c. rectus femoris
d. gluteus medius
e. gracilis
e. gracilis
Muscles of which group share a common origin on the ischium and act to extend the thigh and flex the leg?
a. gluteal muscles
b. quadriceps muscles
c. adductor muscles
d. hamstring muscles
e. peroneal muscles
d. hamstring muscles
- In compartment syndrome, external or internal pressure constrictsthe structures within a compartment, resulting in damaged bloodvessels and subsequent reduction of blood supply. If the syndromeis localized to the posterior crural compartment, what function is most significantly affected?
a. flexion of the wrist
b. abduction of the pollex
c. extension of the knee joint
d. dorsiflexion of the ankle joint
e. plantar flexion of the ankle joint
e. plantar flexion of the ankle joint
The _____________ is a dense connective tissue envelope that surrounds groups of muscles in the body.
perimysium
Arrange the following from largest to smallest: (1) myofibril,
(2) filament, (3) muscle fiber, (4) fascicle.
a. 1, 3, 2, 4
b. 3, 4, 2, 1
c. 3, 1, 4, 2
d. 4, 3, 1, 2
e. 4, 2, 3, 1
a. 1, 3, 2, 4
Connective tissue that separates one muscle fiber from another is the _________________ .
endomysium
