A&P Chapter 10

Which of the following statements is correct regarding muscle position and its related action?
A muscle that crosses on the posterior side of the knee joint produces flexion.
The latissimus dorsi crosses the posterior side of the shoulder joint to produce flexion.
A muscle that crosses the ankle joint anteriorly produces flexion.
The pectoralis major crosses on the anterior side of the shoulder joint to produce extension.

A muscle that crosses on the posterior side of the knee joint produces flexion.

Which of the following statements is correct regarding muscle position and its related action?
The teres major crosses on the medial side of the shoulder joint to produce adduction.
A muscle that crosses the ankle joint posteriorly produces adduction.
The deltoid crosses the shoulder joint medially to produce abduction.
A muscle that crosses on the lateral side of the hip joint produces adduction.

The teres major crosses on the medial side of the shoulder joint to produce adduction.

________ are the muscles primarily responsible for producing a particular movement.

Agonists

Which functional group has the major responsibility for producing a specific movement?
fixators
antagonists
agonists
synergists

agonists

Which of the following is NOT used as a criterion for naming muscles?
whether the muscle is controlled by the involuntary or voluntary nervous system
the number of origins for the muscle
the shape of the muscle
the locations of the muscle attachments
the location of the muscle

whether the muscle is controlled by the involuntary or voluntary nervous system

Which of the following is CORRECTLY matched?

pennate arrangement of fascicles: spindle-shaped muscle
parallel arrangement of fascicles: characteristic of sphincter muscles
circular arrangement of fascicles: describes the deltoid muscle
convergent arrangement of fascicles: fan shaped muscle

convergent arrangement of fascicles: fan shaped muscle

Most skeletal muscles of the body act in ________.

third-class lever systems
power lever systems
second-class lever systems
first-class lever systems

third-class lever system

true or false
The more a muscle shortens during a contraction, the greater the power of the muscle.

false ,the power of contraction is dependent on the number of muscle fibers

Which of the following movements demonstrates a first-class lever?

standing on your toes
lifting a rock with your right hand and arm
raising your head up off your chest
flexing your knee to raise your heel toward your buttocks

raising your head up off your chest

The anterior muscles of the thigh that originate on the os coxae are __________.
sartorius; rectus femoris
sartorius; vastus medialis
rectus femoris; vastus medialis
vastus lateralis; vastus medialis

sartorius; rectus femoris

The two heads of the biceps brachii combine to insert on the __________.
ulnar notch
radial notch
radial tuberosity
olecranon process

radial tuberosity

Both heads of the biceps femoris muscle __________.
extend the hip
extend the leg at the knee
flex the leg at the knee
flex the hip

flex the leg at the knee

The long head of the biceps femoris muscle originates on the __________.

posterior superior iliac spine
ischial tuberosity
iliac crest
anterior superior iliac spine

ischial tuberosity

The biceps femoris is located in the __________.
posterior arm
posterior thigh
anterior thigh
anterior arm

posterior thigh

The deltoid muscle fibers are separated into __________.

superficial and deep
anterior, middle, and posterior
superior, middle, and inferior
lateral, medial, and proximal

anterior, middle, and posterior

The middle fibers of the deltoid muscle __________.

abduct the arm
adduct the arm
medially rotate the arm
laterally rotate the arm

abduct the arm

The origin of the external obliques includes ribs __________.

five through twelve
eight through twelve
seven through twelve
six through twelve

five through twelve eight through twelve seven through twelve six through twelve

The origins of the lateral head of the gastrocnemius muscle are the __________.

medial condyle and posterior surface of the femur
patellar surface and posterior surface of the femur
lateral condyle and posterior surface of the femur
patellar surface and anterior surface of the femur

lateral condyle and posterior surface of the femur

The gastrocnemius muscle is innervated by the __________.

ulnar nerve
tibial nerve
plantar nerve
fibular nerve

tibial nerve

The two heads of the gastrocnemius muscle converge to insert onto __________.

the middle phalanx of digit one
digits two through five
the posterior surface of the tibia
the calcaneus

the calcaneus

The majority of the fibers of the gluteus maximus insert onto the __________.
inferior border of the os coxae
gluteal tuberosity
ileotibial tract
superior border of the os coxae

ileotibial tract

The gluteus maximus is the most powerful muscle during __________.
flexion
lateral rotation
medial rotation
extension

extension

The latissimus dorsi inserts __________.

on the lesser tubercle of the humerus
on the intertubercular groove of the humerus
on the deltoid tuberosity of the humerus
on the greater tubercle of the humerus

on the intertubercular groove of the humerus

One of the actions of the latissimus dorsi muscle is to __________.

abduct the arm
flex the arm
adduct the arm
lateral rotation of the arm

adduct the arm

The masseter muscle originates on the __________.

medial surfaces of the maxilla and the zygomatic arch as well as the inferior border of the zygomatic arch
medial and lateral surfaces of the maxilla and the inferior and superior border of the zygomatic arch
medial surface of maxilla, but not the zygomatic arch
inferior border of the zygomatic arch only

medial surfaces of the maxilla and the zygomatic arch as well as the inferior border of the zygomatic arch

The masseter is innervated by the _____________ branch of the trigeminal nerve.

maxillary
mandibular
ophthalmic
lingual

mandibular

The origin of the rectus femoris is the ____________.

anterior inferior iliac spine
greater trochanter
linea aspera
anterior femur

anterior inferior iliac spine

The rectus femoris muscle extends the leg at the __________.

elbow
knee
ankle
hip

knee

The trapezius muscle may be separated into all of the following groups, except __________.

inferior
lateral
middle
superior

lateral

All fibers of the trapezius muscle are innervated by the __________.

axillary nerve
spinal accessory nerve
coxal nerve
scapular nerve

spinal accessory nerve

All fibers of the triceps brachii are innervated by the __________.

humeral nerve
ulnar nerve
axillary nerve
radial nerve

radial nerve

Which of the following is a hamstring muscle?

biceps femoris
rectus femoris
vastus lateralis
vastus medialis

biceps femoris

All fibers of the pectoralis major muscle converge on the lateral edge of the__________.
radial tuberosity
greater tuberosity
intertubercular sulcus
deltoid tuberosity

intertubercular sulcus

The anterior axial muscle that crosses the glenohumeral joint is the pectoralis major muscle.

True
False

true

The posterior axial muscle that crosses the glenohumeral joint is the __________.

brachioradialis
latissimus dorsi
pectoralis major
trapezius

latissimus dorsi