Muscles Flashcards
Frontalis
O- Occipital bone
I- Skin around eyes
A- elevates skin of the forehead
N- CN VII
Orbicularis Oris
O- Muscles near the mouth
I- Skin around lips
A- puckers lips
N- CN VII
Oribicularis Oculi
O- Maxilla and frontal bone
I- Skin around eyes
A- closing of eyes
N- CN VII
Buccinator
A- Compresses cheeks
N- CN VII
Zygomaticus
O- zygomatic bone
I- skin at corner of mouth
A- elevates sides of mouth, smile
N- CN VII
Masseter
O- zygomatic arch
I- ramus of mandible
A- elevates/protracts mandible
N- V3
Temporalis
O- temporal bone
I- coronoid process and ramus mandible
A- elevates/retracts mandible
N- V3
Medial and Lateral Pterygoids
A- elevates/depresses/side-to-side mandible
Sternocleidomastoid
O- sternum/clavicle
I- mastoid process
A- neck flexion/rotation, forceful inhalation
N- Accessory nerve, CN XI
Scalenes
A- lateral flexion of neck and head
Stylohyoid
temporal styloid process
Digastric
digastic fossa of mandible/mastoid notch
Mylohyoid
mylohyoid line of mandible
Sternohyoid
O- manubrium
I- inferior border of hyoid
Thyrohyoid
O- oblique thyroid cartilage
I- inferior border and greater horn of hyoid
Occipitalis
O- occipital bone
I- epicranial aponeurosis
A- moves scalp backwards
N- CN VII
Omohyoid
O- Sup. border of scapula
I- Inf. border of hyoid, lateral to sternohyoid
Trapezius
O- Sup. nuchal line, occipital protuberance, spine C7-T12
I- Clavicle, acromion, spine of scapula
A- rotates, elevates, adducts, depresses scapula
N- CN XI, 3, 4
Latissimus dorsi
O- T7-L5, sacrum, iliac crest, ribs 10-12
I- humerus
A- extends, abducts, medially rotates humerus
N- Thoracodorsal nerve
Rhomboid major
I- Medial border of scapula
A- adducts and elevates scapula
N- Dorsal scapular nerve
Rhomboid minor
I- Medial border of scapula spine
A- adducts and elevates scapula
N- Dorsal scapular nerve
Levator scapulae
I- upper medial border of scapula
A- elevates scapula
N- Dorsal scapular nerve
Serratus posterior superior
upper back, spine C7-T3 to scapular ribs
A- elevates ribs 2-5
N- Ant. rami of spinal nerves
Serratus posterior inferior
lower back, spine T11-L3, deep to latissimus
A- depresses ribs 9-12
N- Ant. rami of spinal nerves
Splenius
back of neck, skull to vertebrae
A- pull/rotate head
Semispinalis
back of neck, skull to vertebrae, under splenius
A- pull/rotate head
Spinalis
most medial erector spinae
A- extension of head, cervical and thorax
N- lateral post. rami of spinal nerves
Longissimus
intermediate erector spinae
A- extension of head, neck and spine, lateral flexion
N- lateral post. rami of spinal nerves
Iliocostalis
most lateral erector spinae
A- extension and lateral flexion of spine
N- lateral post. rami of spinal nerves
Deltoid
O- acromion, clavicle, lower spine
I- deltoid tuberosity of humerus
A- abducts, lateral/medial rotation of humerus
N- Axillary
Supraspinatus
O- supraspinatous fossa
I- greater tubercle of humerus
A- abducts arm
N- suprascapular
Infraspinatus
O- infraspinatous fossa
I- greater tubercle of humerus
A- laterally rotates arm
N- suprascapular
Teres Major
O- Inf. angle of scapula
I- Medial lip of intertubercular sulcus
A- medial rotation of arm
N- Lower scapular nerve
Subscapularis
O- subscapular fossa
I- leser tubercle
A- medial rotation of arm
N- upper/lower scapular nerves
Pectoralis Major
O- Clavicle, sternum, costal cartilage
I- crest of greater tubercle fo humerus
A- flexes,adducts, medially rotates arm
N- medial/lateral pectoral nerve
Pectoralis Minor
O- ribs 3-5
I- coracoid process
A- forward, medial, downward scapula
N- medial pectoral
Subclavius
between clavicle and rib 1
Serratus anterior
1-8 Ribs under pecs
N- Long thoracic nerve
External oblique
lower 8 ribs, along sides
A- flexes and laterally bends trunk