Chapter 10 A&P
Which letter represents the biceps brachii muscle?
A
Which muscle is a prime mover of arm abduction?
A
Which muscle is the prime mover of arm abduction (assuming all fibers are used)?
A
Identify the gluteus maximus muscle.
B
Which muscle helps a person to cross a leg when seated (place one's lateral ankle on the opposite knee)?
B
Which muscle tenses the skin of the neck and assists in depression of the mandible?
B
Which of the following letters represents the sartorius muscle?
B
________ is a powerful forearm extensor at the elbow joint.
Brachialis
Identify the extensor digitorum longus muscle.
C
Identify the palmaris longus muscle.
C
Which muscle would be a prime mover of knee extension?
C
Which of the following letters represents the infraspinatus muscle?
C
Which muscle is an antagonist to the biceps brachii muscle?
D
Which muscle is known as the "boxer's muscle" for its ability to move the arm horizontally, as in throwing a punch?
D
Which muscle is the prime mover of dorsiflexion?
D. tibialis anterior
Which description of a muscle action is NOT correct? a. Synergists help agonists. b. Fixators hold joints in place, so movement does not occur. c. Agonists are the prime movers for an action. d. Antagonists counter the action of a prime mover.
Fixators hold joints in place, so movement does not occur.
What is the action of the muscle identified by the letter A?
It abducts and medially rotates the thigh and steadies the pelvis. It is an extremely important muscle for walking.
Which of the following statements is FALSE? a. The medial hamstrings promote medial knee (leg) rotation. b. The hamstrings are prime movers of hip (thigh) flexion and knee (leg) flexion. c. The hamstrings cross the hip and knee joints. d. The hamstrings are fleshy muscles of the posterior thigh.
The hamstrings are prime movers of hip (thigh) flexion and knee (leg) flexion.
When the term biceps, triceps, or quadriceps forms part of a muscle's name, what does it tell you about the muscle?
The muscle has two, three, or four origins, respectively.
Which of the following statements is correct? a. Multipennate muscles do not produce much power because the fibers run in many directions. b. Muscle fibers running in parallel arrangement generate more power. c. The number of muscle fibers best determines how powerful a muscle will be. d. The more a muscle shortens, the more power it generates.
The number of muscle fibers best determines how powerful a muscle will be.
Which of the following describes the suprahyoid muscles?
They are a group of muscles that lie superior to the hyoid bone and help form the floor of the oral cavity.
What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?
a synergist
Which of the following muscles is named for its action?
adductor longus
Which of the following muscles is a flexor of the thigh at the hip? tibialis posterior adductor magnus vastus lateralis gluteus maximus
adductor magnus
What is a muscle that provides the major force for producing a specific movement called?
an agonist (prime mover)
A muscle that opposes, or reverses, a particular movement is a(n) ________.
antagonist
Which functional group has the major responsibility for countering a specific movement?
antagonists
Which muscle is represented by the letter D?
biceps femoris
Which of the following is a hamstring muscle?
biceps femoris
The primary function of the deep muscles of the thorax, such as the intercostals, is to promote __________.
breathing
The ________ helps keep food between the grinding surfaces of the teeth during chewing.
buccinator
Identify the action of the muscle at A.
compress the abdomen
The muscle that divides the ventral body cavity into the thoracic and abdominopelvic cavities is the __________.
diaphragm
Which muscles act as antagonists to the muscles responsible for trunk flexion?
erector spinae muscle group
The ________ extends the great toe.
extensor hallucis longus
Which muscles are most responsible for the inspiration phase of normal breathing?
external intercostal muscles and diaphragm
Paralysis of which of the following would make an individual unable to flex the thigh?
iliopsoas and rectus femoris
In general, a muscle that crosses on the anterior side of a joint produces ________.
flexion
Which of the following muscles is named for its size?
gluteus maximus
Which of the following muscles is most responsible for moving the leg laterally away from the body, such as when taking a side step?
gluteus medius
Which muscle is a synergist of the adductor group for adducting the thighs?
gracilis
Which of the following is NOT a member of the hamstrings?
gracilis
Paralysis of which of the following muscles would make an individual unable to flex the knee?
hamstring muscles
Which muscle(s) is (are) contracted to exhale forcibly?
internal intercostals and rectus abdominus
Which of the following is NOT a muscle primarily involved in the breathing process? external intercostal internal intercostal diaphragm latissimus dorsi
latissimus dorsi
Which of the following muscles is NOT a rotator cuff muscle? supraspinatus teres minor subscapularis levator scapulae
levator scapulae
Which major muscles of the trunk insert on the medial edge of the scapula to draw the scapulae together and to tilt the glenoid cavity downward?
levator scapulae and rhomboids
The ________ is the main chewing muscle.
masseter
Which of the following is incorrectly paired? a. deltoid; arm flexion b. trapezius; scapula rotation c. latissimus dorsi; medial arm rotation d. pectoralis major; arm abduction
pectoralis major; arm abduction
Which of the following muscles does NOT act in plantar flexion? flexor digitorum longus gastrocnemius and soleus tibialis posterior popliteus
popliteus
The most powerful muscle in the body is the ________.
quadriceps femoris
Which of the following muscles fixes and stabilizes the pelvis during walking?
rectus abdominis
Which of the following muscles of the trunk originates on the pubic crest?
rectus abdominis
The quadriceps femoris is composed of three "vastus" muscles and the ________.
rectus femoris
Which muscle acts as both a knee (leg) extensor and hip (thigh) flexor?
rectus femoris
Which of the following are correctly matched? a. transverse; parallel to the long axis b. brevis; long c. rectus; straight d. deltoid; at a right angle to the long axis
rectus; straight
Which of the following muscles inserts on the tibia?
sartorius
Which of the following muscles is NOT part of the muscle group known as the quadriceps femoris? sartorius vastus intermedius rectus femoris vastus lateralis
sartorius
Which of these muscles is visible in the figure but NOT indicated by a letter? serratus anterior internal oblique external oblique transversus abdominis
serratus anterior
The major head flexor muscles are the __________.
sternocleidomastoid muscles
The ________ is a synergist of the latissimus dorsi; it extends, medially rotates, and adducts the humerus.
teres major
Which of the following muscles is involved in producing horizontal wrinkles in the forehead? the temporalis the medial pterygoid the zygomaticus major the frontal belly of the epicranius
the frontal belly of the epicranius
Which of the following is NOT used as a criterion for naming muscles?
the nervous system's control of the muscle
Which of the following muscles is involved in crossing one leg over the other to produce the cross-legged position?
the sartorius
What is the main factor that determines the power of a muscle?
the total number of muscle fibers (cells) available for contraction
Which of these is NOT a way of classifying muscles?
the type of muscle fibers
Which of the following muscles serves as a common intramuscular injection site, particularly in infants as the buttocks and arm muscles are poorly developed?
the vastus lateralis
Which muscle group is involved when a "pulled groin" occurs?
thigh adductors
What muscle is primarily responsible for preventing foot drop?
tibialis anterior
Which of the following muscles is involved in inversion at the ankle joint? fibularis (peroneus) tertius extensor digitorum longus fibularis (peroneus) longus tibialis anterior
tibialis anterior
Two muscles in this image, identified by the letters C and D, share a function. What is that function?
to close the jaw
The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?
to initiate abduction of the arm, to stabilize the shoulder joint and to help prevent downward dislocation of the humerus
The main forearm extensor is the __________.
triceps brachii
