Lab 7 OIA

Orbicularis Oculi

Origin: Frontal

Insertion: Skin of eyelid

Action: Closes eye

Zygomaticus

Origin: Zygomatic bone

Insertion: Skin at corner of jaw

Action: Smiling

Orbicularis Oris

Origin: Maxilla

Insertion: Skin of mouth

Action: Purses lips

Buccinator

Origin: Maxilla

Insertion: Orbicularis Oris

Action: Sucks in cheeks

Mentalis

Origin: Mandible

Insertion: Skin of chin

Action: Moves chin

Masseter

Origin: Maxilla

Insertion: Mandible

Action: Chewing

Diagastric

Origin: Mandible

Insertion: Loop of hyoid

Action: Open mouth

Sternocleidomastoid

Origin: Sternum

Insertion: Mastoid process

Action: Rotate head (saying no)

Temporalis

Origin: N/A

Insertion: N/A

Action: Chewing

Deltoid

Origin: Clavicle

Insertion: Humerus

Action: Arm abduction

Pectoralis major

Origin: Clavicle

Insertion: Humerus

Action: Shoulder flexion

Serratus anterior

Origin: Ribs

Insertion: Scapula

Action: Move/hold scapula

External intercostal

Origin: Ribs

Insertion: Ribs

Action: Inspiration

Internal intercostal

Origin: Ribs

Insertion: Ribs

Action: Expiration

Diaphragm

Origin: Ribs

Insertion: Central tendon

Action: 75% of breathing

External oblique

Origin: Ribs

Insertion: Linea alba

Action: Compress abdomen

Internal oblique

Origin: Os coxa

Insertion: Linea alba

Action: Compress abdomen

Rectus abdominus

Origin: Os coxa

Insertion: Sternum

Action: Flex spine (bend over)

Transverse abdominus

Origin: Os coxa

Insertion: Linea alba

Action: Compress abdomen

Trapezius

Origin: Vertebrae

Insertion: Scapula

Action: Move/Stabilize scapula

Latissimus dorsi

Origin: Vertebrae

Insertion: Humerus

Action: Arm adduction

Rhomboid major + minor

Origin: Vertebrae

Insertion: Scapula

Action: Stabilize scapula

Levator scapulae

Origin: Vertebrae

Insertion: Scapula

Action: Elevate scapula

Teres major

Origin: Vertebrae

Insertion: Shaft of humerus

Action: Arm adduction

Supraspinatus, Infraspinatus, Teres minor

Origin: Scapula

Insertion: Head of humerus

Action: Rotate arm