HSCI chapter 10

circular

convergent

fusiform

parallel

multipennate

bipennate

unipennate

agonist

• Prime mover

• Provides the most force

• Ex. Flexion

synergist

• Aid agonist

• Provide supplemental force

Antagonist

• Opposite action of agonist

• Usually located on opposite side of bone/ joint

• ex. extension

Occipitofrontalis

• Elevates eyebrows

• Wrinkles forehead

Orbicularis oculi

closes eye

orbicularis oris

closes and puckers lips

depressor anguli oris

Pulls corners of the mouth inferiorly to frown

zygomaticus major

elevates corners of mouth

Masseter

elevate mandible for actions like chewing

ORBICULARIS ORIS

ZYGOMARTICUS MAJOR

OCCIPITALFRONTALIS

DEPRESSOR ANGULI ORIS

ORBICULARIS OCULI

Sternocleidomastoid

muscle that moves head and neck

External oblique

• Compresses abdominal cavity

• Flexes, laterally flexes (side bend), and rotates trunk

**The purple

Internal oblique

• Compresses abdominal cavity

• Flexes, laterally flexes (side bend), and rotates trunk

• deep to external oblique

**The dark blue

Rectus abdominis

• Compresses abdominal cavity

• Flexes trunk

***the green

Transversus abdominis

• Compresses abdominal cavity

• stabilize the core and spine, acting like a natural corset

The yellow

Pectoralis minor

Depresses and protracts the scapula

Trapezius

• elevates and superiorly rotates scapula

• elevating, depressing, and retracting the scapula

insertion

Tendon attaches to bone(movable part)(ex: radial tuberosity)

Origin

Anchoring point on bones(ex: coracoid process and glenoid cavity)

pectoralis major

• Flexes arm

• Adducts arm

• Medially rotates arm

***PINK

Biceps brachii

• Flexes arm

• Flexes forearm

• LIGHT BLUE

Deltoid

• Abducts arm

• Flexes and medially rotates arm (anterior fibers)

• Extends and laterally rotates arm (posterior fibers

YELLOW

deltoid

yellow

Latissimus Dorsi

• Extends arms

• Adducts and medially rotates arm

blue

triceps brachii

• Extends arm

• extends forearm

PINK

Brachialis

Flexes forearm

Yellow

Brachioradialis

Flexes forearm

Purple

Flexor muscles

Flexes hand

extensor muscles

extends hand

Iliopsoas

Flexes thigh

Green

Sartorius

• flexes thigh

• flexes leg

• purple

Gracilis

• Adducts and flexes thigh

• Flexes leg

Tenor facia latae

Abducts thigh

Gluteus maximus

Extends thigh

Blue

Gluteus medius

• abducts thigh

• green

Hamstrings

extends thigh, flexes leg

Quadricepts

extends legs

• pink

Rectus femoris,Vastus lateralis,Vastus medialis,Vastus intermedius

what muscles makeup quadriceps?

gracilis

• adducts and flexes thigh

• flexes leg

Green

Tibialis anterior

• Dorsiflexion of the foot

• Inversion of foot

Fibularis longus

• Eversion of the foot

• Plantar flexion of foot

Gastrocnemius

plantarflexion of foot