Anatomy Quiz 13

Masseter: Origin

zygomatic arc, maxilla

Deltoid: Origin

acromion and spine of scapula

Tricep Brachii: Origin

long head

Sartorius: Origin

anterior superior iliac spine

Gluteus Maximus: Origin

dorsal ilium, sacrum, and coccyx

Gastrocnemius: Origin

medial and lateral condyles of femur

Masseter: Insertion

angle and ramus of mandible

Deltoid: Insertion

deltoid tuberosity of humerus

Tricep Brachii: Insertion

olecranon of ulna

Sartorius: Insertion

into medial aspect of proximal tibia

Gluteus Maximus: Insertion

gluteal tuberosity of femur and iliotubial tract

Gastrocnemius: Insertion

calcaneal tendon

Masseter: Action

moves jaw, elevates mandible

Deltoid: Action

prime mover of arm abduction

Tricep Brachii: Action

powerful forearm extensor

Sartorius: Action

flexes knees, rotates and laterally moves thigh

Gluteus Maximus: Action

complex, powerful thigh extensor

Gastrocnemius: Action

plantar flexes foot

A prime mover or _______ produces a particular type of movement.

agonist

Skeletal muscles are named on the basis of many criteria such as _________________.

origin, insertion, action

True or False: Muscles of facial expression differ from most skeletal muscles because they usually do not insert into a bone.

True

The __________ musculature includes muscles that move the vertebral column and muscles that move the ribs.

trunk

Muscles that act on the ________ cause movement at the hip, knee, and foot joints.

lower limb

This two-headed muscle bulges when the forearm is flexed. It is the most familiar muscle of the anterior humerus. It is the _________.

biceps brachii

These abdominal muscles are responsible for giving me my "six-pack." They also stabilize my pelvis when walking. They are the __________ muscles.

Rectus Abdominus

This lower limb muscle, which attaches to the calcaneus via the calcaneal tendon and plantar flexes the foot when the knee is extended.

Gastrocnemius

The _________ is the largest and most superficial of the gluteal muscles.

Gluteus Maximus

True or False. The biceps femoris is located in the anterior compartment of the thigh.

False - (posterior)

Origin

muscle end attached to immoveable part

Epimysium

connective tissue surrounding bundle of muscle fibers.

Myosin

protein, works with actin to produce muscle movement

Prime Mover

primary muscle in action

Abduction

away from midline

Perimysium

connective tissue that groups muscle fibers into bundles

Synergist

assists prime mover

Rotation

turning on a longitudinal axis

Actin

protein for contraction and relaxation

Antagonist

opposite actions from prime mover

Insertion

end of muscle attached to an immoveable part

Ligaments

Stabilizes bone

Supination

movement of the palm posteriorly

Extension

increases angle of body parts

Inversion

sole of the foot inwards

Adduction

toward midline

Tendon

connective tissue that attaches muscle to bone

Flexion

brings the insertion toward origin

Circumduction

movement in a circular motion (involves limbs)

Pronation

movement of the palm anteriorly