Class Notes (807,350)
Canada (492,715)
BIOC33H3 (127)

BIOB33 Muscular System (Part 1).docx

5 Pages
Unlock Document

University of Toronto Scarborough
Biological Sciences
Connie Soros

Muscle Name Description Action Origin Insertion Pectoralis Major Broad, fan shaped Adducts the foreleg Sternum Humerus of the foreleg (moves it towards the chest) Pectoralis Minor Smaller muscle in Adducts and retracts Sternum Proximal end of the humans. Posterior the foreleg humerus and deeper to the pectoralis major. Latissimus Dorsi Found near the Moves foreleg caudally - dorsal, lateral and Run anteriorly and armpits of the pig and dorsally ventral sides of the pig insert on the proximal - lumbodorsal fascia end of the humerus on (aponeurosis= sheet of its medial surface connective tissue in the area of the lower back) - lumbar and lower thoracic vertebrae Linea Alba (not a Center of the ventral muscle) abdomen. Thickening of the central part of “alba”= white (albino) the ventral aponeurosis (sheet- like fusion of tendons). Following 4 muscles= abdominal muscles= aid in support of abdominal organs by compressing the abdominal wall + flexing the trunk. “Huff and puff” muscles. Exercised heavily in sit ups. **Look for obliques near legs away from midline. NOT found in every abdominal area. External Oblique Thin sheet of muscle. - posterior ribs -ventral aponeurosis Fibers run caudo- - lumbodorsal near the linea alba ventrally (from head fascia they run in both a caudal and ventral direction) in an oblique direction.4 Internal Oblique Right under the - posterior ribs -ventral aponeurosis external oblique. - lumbodorsal fascia near the linea alba Fibers run caudo- dorsally, perpendicular to those of the external. Transverse Abdominus Deep to internal oblique. Fibers run transversely, from right to left, across the abdominal wall. Others run almost parallel to the external oblique. Rectus Abdominus Covered by very -pubis -sternum, upper ribs tough fascia layer that needs to be removed to see the fibers. External Intercostals Superficial to internal Raise rib cage during intercostals. Caudo- inhalation. ventral direction. Located btwn ribs, towards the back. Cover only dorsal portion of the ribcage. May need to remove fibers of latissmus dorsi/ external oblique. Internal Intercostals Caudo-dorsal Lower the rib cage direction. Found during expiration. along ENT
More Less

Related notes for BIOC33H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.