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
