Muscles of Neck and Trunk Flashcards
Orbicularis Oculi OIA?
Origin: Frontal and Maxilla
(margin of orbit)
Insertion: Skin of Eyelid
Action: closes eyelid
Temporalis OIA?
Origin: temporal fossa
Insertion: coronoid process of the mandible
Action: closes mandible
Masseter OIA?
Origin: Zygomatic Arch
Insertion: mandible
Action: closes mandible
Orbicularis Oris OIA?
Origin: fascia of facial muscles
Insertion: Skin of lips
Action: Closes lips
Scalenes OIA?
Origin: C2- C7(transverse process)
Insertion: 1st and 2nd ribs
Action: elevation of ribs 1 and 2
flexes and rotates neck
Sternocleidomastoid OIA?
Origin: sternum and clavicle
Insertion: mastoid process of the temporal bone
Action: abducts, rotates and flexes head
External Abdominal Oblique OIA?
Origin: Ribs 5-12
Insertion: linea alba, iliac crest
pubis
Action: compress abdominal wall
rotate trunk
Serratus Anterior OIA?
Origin: ribs 1 – 8
Insertion: vertebral border & inferior angle of scapula
Action: abducts scapula
External Intercostals OIA?
Origin: Inferior Border of the rib
Insertion: Superior border of rib
Action: elevates ribs
Internal Intercostals OIA?
Origin: Superior Border
Insertion: Inferior Border of rib above
Action: depresses rib
Diaphragm OIA?
Origin: Xiphoid Process, lower ribs
upper lumbar vertebrae
Insertion: Central tendon
Action: Inspiration (contraction)
Expiration (relaxation)
Rhomboideus Major OIA?
Origin: Spinous process T2 - T5
Insertion: medial border of scapula,
Action: adducts scapula
