O. I. A. Flashcards Preview

Anatomy > O. I. A. > Flashcards

Flashcards in O. I. A. Deck (21):

O: Epicranial Aponeurosis
I: Skin over supraorbital margin (eyebrow skin)
A: Moves scalp, eyebrows; wrinkles skin of forehead

Frontal Belly


O: Medial wall of margin of orbit
I: Skin surrounding eyelids
A: Closes eye: produces winking, blinking, & squinting ("blink muscle")

Orbicularis Oculi


O: Zygomatic Bone
I: Skin at superolateral edge of mouth
A: Elevates corner of the mouth ("Smile" muscle)

Zygomaticus Major


O: body of mandible
I: skin at inferior corner (angle) of mouth
A: draws corners of mouth inferiorly & laterally (frown muscle)

Depressor Anguli Oris


O: zygomatic arch
I: coronoid process, lateral surface, and angle of mandible
A: elevates and protracts mandible; prime mover of jaw closure



O: manubrium and sternal end of clavicle
I: mastoid process
A: UNI: lateral flexion, rotation of head to opposite side
BI: flexes neck (move head back)



O: Ligamentum nuchae & spinous process of c7-t6
I: Occipital bone and mastoid process of temporal bone
A: UNI: turns head to same side
BI: extends head/neck

Splenius capitis and cervicis


A: flattening of diaphragm (moves inferiorly, down) & expansion of thoracic cavity



O: External and inferior borders of the inferior 8 ribs
I: Linea alba by a broad aponeurosis some to iliac crest
A: UNI: laterial flexion of vertebral column, rotation of vertebral column to the opposite side
BI: flexes vertebral column and compresses abdominal wall; used in forced exhalation

External oblique


O: Superior surface of pubis near symphysis
I: Xiphoid process of sternum; inferior surfaces of ribs 5-7
A: flexes vertebral column; compresses abdominal wall, used in forced exhalation

Rectus abdominals


O: occipital bone (superior nuchal line); ligamentum nuchae; spinous processes of C7-T12
I: clavicle; acromion process and spine of scapula
A: Superior fibers: elevate and superiorly rotate scapula
Middle fibers: retract scapula
Inferior fibers: depress scapula



O: Spinous processes of T7-T12; ribs 8-12; iliac crest; thoracolumbar fascia
I: Intertubercular groove of humerus
A: Agonist of arm extension; also adducts and medially rotates arm (swimmers muscle)

Latissimus dorsi


O: Medial clavicle; costal cartilages of ribs 2-6; body of sternum
I: Lateral part of intertuercular groove of humerus
A: flexion
Horizontal addiction of arms
Medial rotation

Pectoralis major


O: Acromial end of clavicle; acromion and spine of scapula
I: Deltoid tuberosity of humerus
A: Anterior fibers: Flex and medially rotate arm
Middle fibers: Agonist of arm abduction
Posterior fibers: extend and laterally rotate arm



O: Long head: supraglenoid tubercle of scapula
Short head: coracoid process of scapula
I: Radial tuberosityy and bicipital aponeurosis
A: Flexes forearm, powerful supinator of forearm
Long head flexes arm

Biceps brachii


O: Transverse processes and bodies of T12-L5 vertebrae
I: Lesser trochanter of femur with iliac us
A: Flexes thigh

Psoas major


O: Iliac fossa
I: Lesser trochanter of femur with psoas major
A: flexes thigh



O: anterior inferior iliac spine
I: quadriceps tendon to patella and then patellar ligament to tibial tuberosity
A: flexes thigh and extends leg

Rectus femoris


O: iliac crest, sacrum, coccyx
I: Illiotibial tract of fascia lata; linea aspera and gluteal tuberosity of femur
A: extends thigh; laterally rotates thigh

Gluteus maximus


O: Lateral condyle and proximal shaft of tibia, interosseous membrane
I: metatarsal I and first (medial) cuneiform
A: Dorsiflexes foot; inverts foot

Tibialis anterior


O: Superior posterior surfaces of lateral and medial condyles of femur
I: Calcaneus (via calcaneal tendon)
A: flexes leg; plantar flexes foot