Muscle and their Actions

Created by moldyweasel 

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73 terms · Muscles and their actions Regions hip, lateral thigh, anterior thigh, posterior thigh, leg, head, neck, trunk, respiration,abdominal wall, pectoral girdle and upper limb, acting on the humerous, acting on radius and ulna, hand and wrist .

Illiacus

muscle of the hip region that flexes the thigh. Bringing it upward.

Psoas Major

muscle of the hip region that flexes the thigh. More bulky one.

Gluteus maximus

muscle of the hip that extends the thigh, most common thought of butt muscle.

Gluteus medius

muscle of the hip that abducts the thigh, lines the illiac crest.

Gluteus minimus

muscle of hip that is most deep aducts the thigh. Common to ask because it is under gluteus medius.

Adductor Longus

adducts thigh. Superficial of the sartorius on medial side near groin.

Adductor Magnus

adducts thigh. Medial side more lateral then Gracilis.

Gracilis

adducts thigh Medial side from posterior view, thinner muscle.

Sartorius

Flexes, abducts, and laterally rotates thigh at the hip; flexes knee ie: crossing your legs. Longest muscle in the body wraps around thigh from anterior view.

Tensor Faciae Latae

Abducts the thigh to take the "at ease" stance. Connects to illiotibial tract or I.T. Band (Aponeurosis is a broat sheet of tendons).

Rectus Femoris

Extends knee and flexes thigh at hip. Anterior thigh wide superficial muscle connecting thigh to knee.

Vastus lateralis

extends leg. Anterior thigh region Lateral side slightly medial of the I.T. Band Superficial.

Vastus medialis

extends leg. Anterior thigh region medial of rectus femoris superficial from anterior view.

Vastus intermedius

Extends leg. Anterior thigh region in between and deeper than vastus lateralis and vastus medialis.

Bicep femoris

Extends thigh and flexes leg. Lateral side from posterior view.

Semimembranosus

Extends thigh and flexes leg. Posterior thigh region; Deeper than semitendinosus, medial of bicep femoris, and slightly lateral of gracilis.

Semitendinosus

Extends thigh and flexes leg. Posterior thigh region; more superficial than semimebranosus. More medial side.

Gastrocnemius

Plantar flextion of foot. Muscle region the leg; Calf muscle superficial from posterior view.Extends to Calcaneal tendon. (Achilles Tendon).

Soleus

Plantar flextion of foot. Muscle from leg region; Lateral side from the posterior view.

Tibialis anterior

Dorsiflextion of foot; muscle of leg region; more medial than fibularis longus.

Fibularis longus

Plantar flexion and eversion of foot. Lateral shin muscle from the anterior view.

Extensor digitorum longus

Extends toes II-V. Muscle of the leg. Continues to toes in between tibialis anterior and fibularis longus from anterior view.

Orbicular oris

_______is the muscle around the mouth; moves your lips up and down, allows closing of lips. Deep muscle around lips.

Orbicular oculli

Action; closes the eyes. Muscles superficial surrounds eyes. Anterior view.

Zygomaticus

Action; draws mouth up and lateral (smiling). Minor on superior and major on the posterior. Superficial cheek region.

Masseter

Elevates mandible. Cheek region deep muscle. For chewing.

Temporalis

Elevates mandible. More medial that massete; deep region of cheek.

Buccainator

compress cheek. Deep cheek lateral side.

Sternocleidomastoid

flexes neck, lateral rotation of head. Ear down your neck.From lateral view.

Digastric

V-Shaped throat muscle. Opens mouth, depresses mandible, elevates hyoid bone during swallowing.

External intercostals

Muscle for respiration. Elevates rips during inspiration. Lateral view. deep.

Internal intercostals

depresses ribs during forced expiration deep medial rib side.

Diaphragm

Increases volume of thoracic cavity for inspiration.

External oblique

Superficial of transverse abdominus. Action: compresses abdomen, flexes and rotates trunk.

Internal oblique

More deep than external oblique. Action; compresses abdomen, flexes and rotates trunk.

Transverse abdominus

compresses abdomen, deepest layer of ab muscles. Going across.

Rectus Abdominus

compresses abdomen, and flexes trunk. Straight superficial six pack muscle.

Pectoralis Minor

depresses and moves scapula anteriorly. Attaches to ribs superior and goes to scapula.

Serratus anterior

O: first 8-9 ribs | I: inside of vertebral border of scapula | A: protraction and upward rotation of shoulder

Trapezius

Muscles acting on the shoulder. Posterior view superficial triangular muscle. Action; elevates, depresses, retracts scapula, and extends head.

Rhomboid major

adducts scapula. posterior to the minor deeper than the trapezius. Posterior view.

Rhomboid minor

adducts scapula. Deep . More superior than the major. Posterior view

Pectoralis major

flexes and adducts arm, superficial and on the anterior view.

Latissimus dorsi

Extends and adducts arm, Superficial on the posterior side. Upper back muscle.

Deltoid

Abducts arm, also can flex or extend. Triangular shaped. Shoulder muscle.

Supraspinatus

Abducts arm, muscle superior to the clavicle from posterior view deep. (makes up rotator cuff)

Infraspinatus

Lateral rotation of the arm; posterior to the clavicle from posterior view deep. (rotator cuff)

Teres Major

medial rotation of arm. Posterior to minor superficial muscle from the posterior view.

Teres Minor

Lateral rotation of the arm. Posterior superficial side superior to teres major.

Subscapularis

Rotates arm medially. Posterior to clavicle.

Triceps Brachii

Extends forearm and arm Superficial from posterior view.

biceps brachii

Flexes forearm. anterior view superficia, brachial region muscle.

brachioradialis

flexes forearm. Anterior view superficial lateral side of forearm.

brachialis

flexes forearm, deep muscles in brachial region.

pronator teres

rotates the forearm medially. Superficial in anatomical position, supine. Pronates-palm up to down.

Supinator

rotates the forearm laterally. Deep supines- palm down to up.

Flexor carpi radialis

anterior of forearm goes to wrist on the thumb side.Action flexes and abducts hand.

Flexor digitorum superficialis

muscle that flexes the fingers. (leads to the flexor retinaculum).

Palmaris longus

long muscle that connects to palm (only tendon over the flexor retinaculum). Action; flexes hand.

Flexor carpi ulnaris

posterior and superficial muscle that connects the forearm to the wrist on the pinky side. Action; flexes and adducts hand.

Extensor carpi radialis longus

long muscles from the forearm to the wrist. anterior and superficial . Elbow to thumb side of the wrist. Action; extends and abducts hand.

Extensor carpi radialis brevis

slightly deeper and shorter than the extensor carpi radialis longus. More medial than the extensor digitorum. Action; extends and abducts hand.

Extensor digitorum

Posterior, Big center muscle of forearm.Action; extends wrist & extend fingers II-V. (for extensor retinaculum).

Extensor digiti minimi

Action; extends finger V. More lateral than extensor digitorum in superficial forearm.

Extensor carpi ulnaris

Action; extend and adducts hand. Starts at elbow to pinky side of wrist.

flexor retinaculum

located at base of palm on anterior side of hand--covers flexor tendons and prevents bowstringing except palmaris longus.

extensor retinaculum

posterior of carpal bones to hold tendon down.

Rotator cuff

S.I.T.S supraspinatus, infraspinatus, teres minor, subscapularis.

Brachial plexus

(only on cadaver) brachial region nerves noodle like.

Femoral nerve

from lumbar plexus thigh nerve.

Illitobial tract

broad sheet of tendons on lateral side of thigh

sciatic nerve

from sacral plexus goes from butt to achilles tendon

calcaneal tendon

achilles tendon (aponeurosis)

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