Muscles 1 - Origins and Insertions

Self Tests

WebAnatomy Home : Muscular System : Muscles 1 - Origins and Insertions

Muscles 1 - Origins and Insertions
1.	Origin: Margin of orbit Insertion: Eyelid and skin of face Action: Closes eye; blink
2.	Origin: Maxilla and mandible Insertion: Skin of lips Action: Purses lips
3.	Origin: Zygomatic bone Insertion: Mandible Action: Elevates mandible; mastication
4.	Origin: Manubrium and clavicle Insertion: Mastoid process of temporal bone Action: Bilateral contraction flexes head at neck; Unilateral contraction bends neck towards shoulder or laterally rotates head
5.	Origin: Inferior clavicle and fascia of chest Insertion: Inferior surface of mandible Action: Draws corners of mouth inferiorly and tenses skin of neck by drawing it superiorly
6.	Origin: Inferior border of superior rib Insertion: Superior border of inferior rib Action: Elevates ribs
7.	Origin: Superior boarder of inferior rib Insertion: Inferior boarder of superior rib Action: Depresses ribs
8.	Origin: Inferior border of rib cage (Inferior costal aperture) Insertion: Central tendon Action: Contraction increases intra-thoracic space thereby decreasing intra-thoracic pressure
9.	Origin: External, inferior borders of ribs Insertion: Linea alba and iliac crest Action: Flexes spine at the hip; compresses abdomen
10.	Origin: Pubic bone (pubis) Insertion: Costal cartilages and xiphoid process Action: Flexes spine at the hip; compresses abdomen

©2005 Regents of the University of Minnesota. All rights reserved.	Trouble seeing the text? \| Contact U of M \| Privacy
The University of Minnesota is an equal opportunity educator and employer.	Last modified on November 14, 2005