origins insertions and actions muscles head neck upper extremity

Created by roserriffic 

Upgrade to
remove ads

29 terms

Frontalis

o: epicranial aponeurosis(galea aponeurotica)
i: skin of eyebrow and nose
a:raises eyebrows, wrinkles forehead, tenses and retracts scalp

genioglossus

o: medial surface of mandible near chin
i:body of tongue, hyoid bone
a:depresses and protracts tongue

geniohyoid

o: medial surface of mandible near chin
i: hyoid bone
a: depresses mandible or elevates larynx. Pulls hyoid bone anteriorly

masseter

o:zygomatic arch
i:mandiblular ramus(lateral side)
a:elevates mandible

medial pterygoid

o:medial surface of lateral pterygoid plate of sphenoid bone, maxilla, and palantine bone
i:medial surface of mandible near its angle
a: acts with the lateral pterygoid muscle to protrude mandible and to promote side-to-side gringding movements;synergist of temporalis and masseter muscles in elevation of the mandible.

mylohyoid

o:medial surface of the mandible
i: median connective tissue that attaches to hyoid bone
a: elevates floor of the mouth and depresses mandible

sternocleidomastoid

o: clavicle and manubrium
i:mastoid process
a:rotates face to opposite side, laterally flexes head to same side

styloglossus

O: styloid process of temporal bone.
I: side and undersurface of tongue.
A: elevates tongue and draws it posteriorly (retraction).

stylohyoid

O: Styloid process
I: Body of hyoid bone
A: Elevates and retracts hyoid bone

temporalis

o: temporal bone
i: mandible;
a: closes jaw

zygomaticus major

O: Zygomatic bone
I: angle of mouth
a:Draws angle of mouth upward and laterally in laughing

biceps brachii

O:short head: coracoid of scapula
long head: supraglenoid tubercle of scapula
I: *tuberosity of the radius
A: flex the elbow (humeroulnar joint)
supinate forearm (radioulnar joint)
flex shoulder (glenohumeral joint)

brachialis

o: humerus;
i: ulna;
a: elbow flexion

brachioradialis

o: lateral supracondylar ridge at distal end of humerus
i: base of styloid process of radius
a: synergist in forearm flexion stabilizes elbow during rapid flexion and extension

deltoid

o:latearl third of clavicle; acromion and spine of clavicle embraces insertion of trapezius
i:deltoid tuberosity of humerous
a:prime mover of arm abduction when all its fibers contract simultaneously

digastric

o;lower margin of mandible and mastoid process of temporal bone
i: by connective tissue loop to hyoid bone
a: open mouth and depress mandible

latissimus dorsi

o:indirect attachment via lumbodorsal fascia into spines of lower six thoracic vertebrae
i: spirals around teres major to insert in floor of intertubercular sulcus of humerous
a: prime mover of arm extension;powerful arm adductor; medially rotates arm@shoulder

platysma

o; fascia of chest (over pectoral muscles and deltoid)
i: lower margin of mandibel, and skin and muscle at corner of mouth
a: tenses skin of neck helps depress mandible pulls lower lip down and back

pectoralis major

o;sternal end of clavicle, sternum, cartilage of ribs 1-6 & aponeurosis of external obliques
i: fibers converge to insert by a short tendon into inter tubercular sulcus & greater tubercle of humerus
a: prime mover of arm flexion; rotates arm medially;adducts arm

biceps femoris

O;ischial tuberosity & linea aspera of femur
I; head of fibula, lateral condyle of tibia
A: Hip: extension, lateral rotation.
Knee: flexion

gastrocnemius

O:femoral condyles
I: calacaneus via calcaneal tendon
A: foot: plantar flexion, inversion
Knee: flexion

Gluteus Maximus

O: iliac crest, lateral surface of ilium, sacrum, coccyx,lumbodorsal fascia
I: iliotibial tract, gluteal tuberosity of femur
A: Hip: extension lateral rotation

gluteus medius

O: anterior iliac crest, lateral surface of ilium
I:greater trochanter of the femur
A: Hip: abduction, medial rotation

Gracilis

O-INFERIOR RAMIS OF THE PUBIS/
I- PROXIMAL MEDIAL SURFACE OF THE TIBIA/
A- ADDUCTS THE THIGH

rectus femoris

O; anterior inferior iliac spine, superior acetabular rim
I: tibial tuberosity
A: Knee: extension
Hip: flexion

sartorius

O:anterior superior iliac spine
I:Tibia : medial surface
A:Hip: flexion, lateral rotation
knee: flexion

Semimembranious

O:ischial tuberosity
I: Tibia medial condyle
A:Knee: flexion.
Hip: extension , medial rotation

soleus

O:head of fibula and shaft of tibia
I: calcaneous via calcaneal tendon (tendocalcaneous)
A:Foot: plantar flexion

Psoas Major

O-BODY AND TRANSVERSE PROCESS OF THE LUMBAR VERTEBRAE/
I-LESSER TROCHANTER VIA ILIOPSOAS/
A- FLEXES THIGH WHEN BACK IS FIXED; FLEXES VERTEBRAL COLUMN AND PELVIS ON FEMUR AS IN SIT UP, THIGHS ARE FIXED.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set