Topic 10: Muscular System Gross Anatomy

In order for both eyes to direct their gaze to the right, which of the following muscles are used? 1) right lateral rectus 2) right medial rectus 3) left lateral rectus 4) left medial rectus

1 and 4

The muscle that is used to cross the legs is the

Sartorius

Supination of the forearm and hand is accomplished by the

biceps brachii and supinator

Of the following muscles of the thigh, which one is NOT part of the quadriceps group?

biceps femoris

Of the following muscles of the thigh, which one is on the posterior side?

biceps femoris

The flexion of the elbow represents a

class III lever system (most common)

Triangular muscles, like the pectoralis major are also called _____ muscles.

convergent

Damage to the muscle called the levator ani would result in

decreased support for the pelvic viscera

All of the following muscles are rotators of the arm. Which is a lateral rotator of the arm?

deltoid

Raising your arm to shoulder level is accomplished almost entirely by the

deltoid

inferior rectus

depresses eye and turns it medially

biceps brachii

flexes elbow and supinates forearm

List the arrangement of components found in a third-class lever.

fulcrum-pull-weight

The adductor longus is named for its

function and size

Muscles can be classified by their shape and fascicle orientation. Which shape has the muscle fibers that run the length of the muscle and taper at each end?

fusiform

When you say "ah" and stick out your tongue, which muscle do you use?

genioglossus

The biceps femoris is part of the

hamstrings

Which of the following muscles is part of the rotator cuff?

infraspinatus

superior oblique

rotates the eye downward and away from the midline

Which of the following is the longest muscle in the body?

sartorius

Which abdominal wall muscle inserts on the xiphoid process and the linea alba?

transversus abdominis

Which of the following muscles is named for its shape?

trapezius

external oblique

Compresses abdomen; laterally flexes and rotates vertebral column

Sternocleidomastoid

Contraction of one side: laterally flexes neck, rotates head to opposite side; Contraction of both sides together: flexes neck

In order to put on a glove, the fingers are abducted by hand muscles called the

dorsal interossei

Contraction of the inferior rectus muscle directs the pupil to look

down

superior rectus

elevates eye and turns it medially

Skeletal muscles

extend from one bone to another bone

Which muscle extends the four lateral toes?

extensor digitorum longus

Which muscle everts and plantar flexes the foot?

fibularis brevis

The teres major and teres minor are not involved in

flexion and abduction of the arm.

The rotator cuff muscles

hold the head of the humerus in the glenoid fossa of the scapula.

The term "shin splints" is associated with

injuries resulting from excessive stress on the tibialis anterior

When a skeletal muscle contracts to cause a given movement, the more movable end of attachment of a muscle is termed its

insertion

Of the following muscles of the head, which one wraps around the orbits?

orbicularis oculi

The sternocleidomastoid muscle extends from the mastoid process of the temporal bone to the sternum and medial clavicle. When both sternocleidomastoid muscles contract, the head is flexed. The end of the muscle that connects to the sternum is the

origin

The brachioradialis is named for its

origin and insertion

Which of the following muscles of the chest has its insertion on the humerus?

pectoralis major

The orbicularis oris muscle

puckers the mouth for kissing

Which abdominal wall muscle originates on the iliac crest and the lower lumbar vertebrae?

quadratus lumborum

Which of the following muscles is named for its location?

quadriceps femoris

The muscle shape that has the capacity to shorten to the greatest degree is

straight

Which muscle fixes the clavicle or elevates the first rib?

subclavius

If abdominal muscles are contracted while the vertebral column is fixed this will aid in Select one: a. vomiting. b. childbirth. c. urination. d. defecation. e. All of these choices are correct.

All of these choices are correct.

Trapezius

Elevates, depresses, retracts, and rotates the scapula; rotates the arm

In humans

back muscles are strong to maintain erect posture

Which of the following muscles would be considered an antagonist to the rectus femoris?

biceps femoris

The orbicularis oculi muscle

causes crow's feet wrinkles

In the body's lever systems, the

joint represents the fulcrum point.

The infraspinatus

laterally rotates the arm

The pelvic diaphragm is formed by the

levator ani and coccygeus muscles

Which back muscle extends the head?

longissimus capitis

The type of muscle that functions as a sphincter is

orbicular

Which of the following muscles is involved in chewing gum?

masseter

linea alba

midline tendinous seam joining the abdominal muscles

The digastric muscle is involved

opening he mouth

The prime mover is

the muscle that does most of the movement

Of the following muscles of the leg, which one is on the anterior side of the leg?

tibialis anterior