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Muscle Origins, Insertions, Actions
N/A
13
Anatomy
Undergraduate 1
01/29/2013

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Cards

Term
External Oblique
Definition
Origin: lower ribs
Insertion: iliac crest & linea alba
Action: compresses abdomen
Term
Internal Oblique
Definition
Origin: iliac crest & inguinal ligament
Insertion: lower ribs & linea alba
Action: compresses abdomen
Term
Rectus Abdominis
Definition
Origin: pubic bone
Insertion: costal cartilages & xiphoid process
Action: flexes trunk on pelvis
Term
Pectoralis Major
Definition
Origin: clavicle, sternum, ribs
Insertion: intertubercular sulcus of humerus
Action: flexes arm
Term
Pectoralis Minor
Definition
Origin: ribs 2-5
Insertion: coracoid process of scapula
Action: depresses shoulder
Term
Serratus anterior
Definition
Origin: ribs 2-9
Insertion: medial border of scapula
Action: protracts shoulder
Term
Trapezius
Definition
Origin: Nuchal lines of occipital bone & spinous processes of C-7 and T-12
Insertion: clavicle, acromion, spine of scapula
Action: descending part elevates shoulder, transverse part retracts scapula, ascending part depresses shoulder
Term
Latissimus dorsi
Definition
Origin: lower thoracic & lumbar spinous processes, iliac crest
Insertion: intertubercular sulcus of humerus
Action: extends arm
Term
Rhomboids
Definition
Origin: upper thoracic spinous processes
Insertion: medial border of scapula
Action: adducts scapula
Term
Levator scapulae
Definition
Origin: transverse processes of cervical vertebrae
Insertion: upper medial border of scapula
Action: adducts scapula
Term
Deltoid
Definition
Origin: clavicle, acromion, spine of scapula
Insertion: deltoid tuberosity of humerus
Action: flexes arm
Term
Masseter
Definition
Origin: zygomatic arch
Insertion: ramus of mandible
Action: elevates mandible when chewing
Term
Temporalis
Definition
Origin: temporal bone
Insertion: coronoid process of mandible
Action: elevates mandible
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