PSIO 201 Practical 3 - Muscle Actions

Depresses, abducts/protracts, and inferiorly rotates the scapula

Actions of pectoralis minor

Abducts/protracts and superiorly rotates the scapula

Actions of serratus anterior

Flexes, adducts, and medially rotates the arm

Actions of pectoralis major

Extends and laterally rotates the arm

Actions of posterior deltoid

Abducts the arm

Actions of supraspinatus

upper and lower part of trap, serratus anterior

upward rotators of the scapula

levator scapulae, rhomboids, pectoralis minor

downward rotators of the scapula

adducts/retracts, elevates, and inferiorly rotates the scapula

rhomboid major and rhomboid minor

whole arm going forward

flexion

whole arm going backward

extension of the arm

flexes, adducts, and medially rotates the arm

pectoralis major

flex and medially rotate the arm

anterior deltoid fibers

abducts the arm

middle deltoid fibers

extends and laterally rotates the arm

posterior deltoid fibers

abducts the arm

supraspinatus

adducts and laterally rotates the arm

infraspinatus

extends, ADDUCTS, and MEDIALLY rotates the arm

teres major

extends and LATERALLY rotates the arm

teres Minor

medially rotates the arm

subscapularis

adducts, extends, and medially rotates the arm

latissimus dorsi

biceps brachii, triceps brachii, brachialis, brachioradialis, pronator teres

muscles that move the forearm

flexes and supinates the forearm, FLEXES THE ARM

biceps brachii

Flexes the forearm

brachialis (DEEP TO BICEPS BRACHII)

extends the forearm and EXTENDS THE ARM

triceps brachii

pronates and flexes the forearm

PRONATor teres

pronates and flexes the forearm

brachioradialis

a passive process where the diaphragm external and intercostal muscles relax

expiration

elevates the ribs during inspiration, contracts during quiet inspiration AND labored inspiration

external intercostals

depresses the ribs during labored EXPIRATION

INTERNAL intercostals

contracts downward during inspiraton to expand thoracic cavity, contracts during quiet inspiration and during labored inspiration

diaphragm

transverse abdominus, internal oblique, rectus abdominus, external oblique

compression of the abdomen

lol

spinalis stuff...

draws scalp posteriorly

occipitalis

elevates and retracts the mandible

temporalis

elevates retracts protracts mandible

masseter

depresses the lower lip and mandible, tenses skin of the neck

platysma

skeletal muscle > fascicle > motor unit > muscle fiber > neuromuscular junction > myofibril > sarcomere > myofilament > muscle contraction

macro to micro level of muscle a&p

somatic motor neuron and all muscle fibers it innervates

motor unit

thigh going upwards/forward

FLEXIONNNNN

thigh going backwards

EXXXXXXXXTENSION

flex and laterally rotate the thigh

psoas major and iliacus

iliopsoas muscle group

psoas major + iliacus

flex and laterally rotate the thigh

actions of iliopsoas muscle group

abducts and medially rotates the thigh

gluteus medius AND gluteus minimus

abducts and laterally rotates the thigh

piriformis (triangle muscle deep to gluteus max)

flexes and abducts the thigh

tensor fascia latae (LOTS of the white stuff/fascia)

adducts, flexes, medially rotates, AND extends the thigh

adductor magnus

adducts, flexes, and medially rotates the thigh

adductor longus

adducts and medially rotates the thigh AND flexes the leg

gracilis

adducts, flexes, and medially rotates the thigh

adductor brevis

flexes the leg AND flexes, abducts, and LATERALLY rotates the THIGH

sartorius

extends the leg AND FLEXES the thigh

rectus femoris

extends the leg ONLY

Vastus medialis, intermedius, lateralis

rectus femoris, vastus muscles

quadriceps group

biceps femoris, semitendinosus, semimembranosus

hamstrings group

flexes the leg and extends the thigh

biceps femoris

flexes the leg and extends the thigh

semitendinosus

flexes the leg and extends the thigh

semimembranosus

everts and plantar flexes the foot

fibularis longus

everts and plantar flexes the foot

fibularis brevis

gastrocnemius and soleus

calf muscles

flexes the leg AND plantar flexes the foot

gastrocnemius

plantar flexes the foot

soleus

dorsiflexes and inverts the foot

tibialis anterior

plantar flexes and inverts the foot

tibialis posterior

extends digits II-V OF THE FOOT

extensor digitorum LONGUS

flexes digits II-V of the foot

flexor digitorum longus

flexes the hallux

flexor hallucis longus

flexor hallucis longus

which is lateral: flexor digitorum longus, flexor hallucis longus