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BIO120H1 (1,171)


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Dr.Rosada Silva

VENTRAL MUSCLES Pectoralis major  Originates: sternum  Inserts: humerus of the foreleg  Function: adducts humerus Pectoralis minor  Originates: sternum  Inserts: proximal end of humerus  Function: adducts and retracts foreleg Latissimus Dorsi:  Origin: dorsal, ventral, lateral sides of the body, fibers from lumbodorsal fascia and lumbar and thoracic vertebrae  Inserts: proximal end of the humerus on its medial surface  Function: moves foreleg caudally and dorsally Linea Alba:  Origin: found at center of the ventral abdomen  Structure is a thickening of the central part of the ventral aponeurosis (a sheet like fusion of the tendons)  Lumbodorsal fascia is another example of an aponeurosis HUFF AND PUFF MUSCLES External Oblique:  Origin: from posterior ribs and lumbodorsal fascia  Inserts: ventral aponeurosis near linea alba  Fibers run caudo ventrally in an oblique direction Internal Oblique:  Just under the external oblique  Fibers of the internal oblique run caudo-dorsally which is perpendicular to those of the external oblique Transverse Abdominus  Reflect internal oblique and transvers Ab is underneath  Some of its fibers run transversely across abdominal wall  Others run almost parallel to the external oblique Rectus Abdominus  Runs from pubis to sternum and upper ribs  Covered by a very tough fascia layer NECK MUSCLES Brachiocephalic:  Originates: from back of neck, back of head and mastoid process  Inserts: humerus  Function: moves forelimb anteriorly St
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