A&P Final Review - Muscle Locations & Functions

• Latissimus dorsi
• Pectoralis major
• Biceps brachii
• Triceps brachii
• Quadriceps group:
• Serratus anterior

• Rectus femoris
• Vastus lateralis, medialis and intermedius

Hamstring Group:

• Biceps femoris
• Semitendinosus
• Semimembranosus

• Buccinator
• Masseter
• Temporalis

• deep to platysma
• on anterolateral surface of neck. 2 parts.

flexes and laterally rotates head.

• most superficial of posterior thorax
• originates in occipital bone
• insertion along acromion and spine of scapula

Stabilizes, raises, retracts, rotates the SCAPULA

• flat muscle of lower back
• lumbar regions.
• origin lower 6 thoracic vert., lower ribs, iliac crest, scapula's inf. angle

• PRIME MOVER of arm EXTENSION
• Arm adductor
• Medially rotates arm at shoulder

• fan shaped on superior chest
• forms anterior axillary fold.

• PRIME MOVER of arm FLEXION
• rotates arm medially
• adducts arm against resistance

• fan shaped, deep to scapula
• on entire anterior serface of vertebral border of scapula
• Rotates scapula so that inferior angle goes laterally and Upward.

straight muscle pair from pubis to rib cage

flexes and rotates lumbar region of spine.

largest of lat muscles

pair contract together: flex spine, compress ab. wall.

individually; trunk rotation and lat. flexion.

External: 11 pairs between ribs. Fibers run down and forward.

Pull Ribs toward one another to ELEVATE rib cabe. (external, forward, elevate)

Internal: 11 pairs run down and back

• Pull ribs together and depress rib cage. to aid in forced expiration
• (internal, back, exhale)

pierced by aorta, inferior vena cava and esophagus.

forms floor of thoracic cavity

• PRIME MOVER of Inspiration. Flattens on contraction.
• increases vert. dimensions of thorax
• increases intra-abdominal pressure.

rounded part of shoulder

PRIME MOVER of arm abduction when all fibers go simultaneously.

antagonist of pecs and lat. dorsi

can do flex and med. rotation of humerus with anterior fibers.

can do extension and lateral rotation of arm with posterior fibers.

• Prime mover:
• 2 headed muscle

• stabilizes shoulder joint
• flexes elbow
• supinates forearm

• under inguinal ligament
• (tenderloin)
• longer, thicker, medial of pair
• PRIME MOVER of THIGH FLEX or TRUNK flex on THIGH

long straplike muscle oblique from thigh to knee

• FLexes, Abducts, laterally rotates thigh
• flexes knee

long thin muscle of medial thigh

• ADDUCTS thigh,
• flexes and medially rotates leg.

Adductor Longus: big one over the middle of the magnus:

Adducts, flexes, medially rotates thigh

Adductor magnus: adducts, medially rotates thigh, and back part goes with hamstrings in THIGH EXTENSION

Rectus femoris: straight down thigh

extends knee, flexes thigh at hip

Vastus lateralis: lateral part of thigh

extends and stabilizes knee

Vastus medials: inferomedial aspect of thigh

Extends knee

• Vastus intermedius: hiding under femoris. between v. lat and v. med. on anterior thigh.
• Extends knee

• largest glute
• bulk of mutt mass.

Major extensor of thigh.

Biceps femoris

Semitendinosus

Semimembranosus

big muscle of calf

• plantar flexes foot.
• can flex knee if foot is dorsiflexed

deep to gastrocnemius

• plantar flexes foot.
• important for dancing, walking, running