cutaneous trunci muscle
tightly adhered to skin, twitches skin
Superficial pectoral muscle: descending and transverse
origin: cranial sternum
insertion: crest of the greater tubercle of the humerus
action: adduct the limb
Deep pectoral muscle
Origin: full length of the sternum
Insertion: greater tubercle of the humerus
Action: adducts and pulls limb caudally
Brachiocephalicus muscle: a "Y" shaped muscle with three parts.
Origin: clavicular intersection
Insertion: distal humerus (cleidobrachialis), cervical vertebrae/cranium (cleidocephalicus) mastoid process of temporal bone (cleidomastoideus)
Action: to advance the limb; to extend the shoulder and draw the neck and head
trapezius muscle
Origin: Dorsal aspect of neck
Insertion: Spine of scapula
Action: Elevates and abducts limb; holds scapula to
thorax
Rhomboideus muscle
origin: Occipital bone
insertion: dorsal border of scapula
Action: Elevates forelimb, holds scapula to
thorax
Latissimus dorsi muscle
Origin: Last 7 thoracic vertebrae and spinous process of lumbar vertebrae
Insertion: proximal humerus
Action: Draws limb caudally Flexes shoulder joint
Serratus ventralis muscle
Origin: cervical vertebra and ribs
Insertion: Dorsomedial scapula
Action: Supports trunk, Holds scapula to
thorax
Sternocephalicus muscle
Origin: sternum
Insertion: Occipital bone
Action: Draws head side to side
Platysma muscle
Origin: raphe on doral midline neck skin
Insertion: Attaches to muscles of lips
Action: draws commissures of lips caudally
Temporalis muscle
Origin: Parietal bone of skull
Insertion: Coronoid process of mandible
Action: closes mouth when chewing
Masseter muscle
Origin: Zygomatic arch
Insertion: Lateral side of the mandible
Action: Elevates the mandible to close the mouth when chewing
Digastricus muscle
Origin: Occipital and temporal bones
Insertions: Ventral mandible
Action: opens mouth
Mylohyoideus
Origin: Medial mandible
Insertion: Median raphe between mandibles
Action: Raises floor of mouth
Attachment
the junction of a skeletal muscle to bone. 3 types: tendon, aponeurosis and fleshy
Tendon
Attaches muscle to bone: an extension of the epimysium that consists of dense connective tissue
Aponeurosis
strong sheet of tissue that acts as a tendon to attach muscles to bone or muscle
Fleshy
an apparent direct attachment of muscle to the bone; in reality the muscle attaches to the periosteum of the bone by very short tendons
Origin
attachment of a muscle that remains relatively fixed during muscular contraction
Insertion
The attachment of a muscle tendon to a moveable bone or the end opposite the origin
Action
the body movement that a contraction of the muscle will produce
Umbilicus
depression on the abdomen marking site of entry of umbilical cord
Costal arch
caudal ventral border of the rib cage formed by the costal cartilages of the 10th, 11th and 12th ribs; the 13th rib does not attach to the costal arch.
Clavicular intersection
Divides the brachiocephalicus into two parts. Origin of both parts.
Jugular groove
Formed by the edges of the brachiocephalicus and sternocephalicus muscles. Jugular vein lives in the groove.