10. Muscles

Name two muscles in each of the following compartments or regions:

f. Third muscle layer of the foot

g. Posterior compartment of leg

h. Medial compartment of thigh

i. Posterior compartment of thigh

The strongest masticatory muscle is the

(a) Pterygoid

(b) Masseter

(c) Temporalis

(d) Mandible

Mary's newborn is having trouble suckling. The doctor suggests that it may be a problem with a particular muscle. What muscle is the doctor probably referring to?

(a) Orbicularis oris

(b) Buccinator

(c) Masseter

(d) Risorius

(e) Zygomaticus

When Mrs. O'Brien returned to her doctor for a follow-up visit after childbirth, she complained that she was incontinent (having problems controlling her urine flow) when she sneezed. The physician asked his nurse to give Mrs. O'Brien instructions on how to perform exercises to strengthen the muscles of the pelvic floor. To which muscles was he referring?

A prime mover of thigh flexion is the:

a. Rectus femoris

b. Iliopsoas

c. Vastus muscles

d. Gluteus maximus

The arrangement of muscle fibers in which the fibers are arranged at an angle to a central longitudinal tendon is:

a. Circular

b. Longitudinal

c. Pennate

d. Parallel

The muscles that rotate the radius without producing either flexion or extension of the elbow are the

(a) Brachialis and brachioradialis

(b) Pronator teres and supinator

(c) Biceps brachii and triceps brachii

(d) a, b, and c.

The major extensor of the elbow is the

(a) Triceps brachii

(b) Biceps brachii

(c) Deltoid

(d) Subscapularis

Name and describe the action of muscles used to shake your head no; to nod yes.

The muscles of the vertebral column include many posterior extensors but few anterior flexors. Why?

Several muscles act to move and/or stabilize the scapula. Which of the following are small rectangular muscles that square the shoulders as they act together to retract the scapula?

a. Levator scapulae

b. Rhomboids

c. Serratus anterior

d. Trapezius

The thick, bandlike muscle of mastication that covers much of the ramus of the mandible is the:

a. masseter muscle.

b. temporalis muscle.

c. lateral pterygoid muscle.

d. risorius muscle.

Important flexors of the vertebral column that act in opposition to the erector spinae are the

(a) Rectus abdominis

(b) Longus capitis

(c) Longus colli

(d) Scalene