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Chpt 2: D.1 & D.2
Pig Disection: Muscles
21
Biology
12th Grade
01/14/2013

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Term
Trapezius
Definition
The most obvious superficial muscle of the shoulder that holds the scapula in place and moves it forward and backward
Term
Cleidobrachialis
Definition
Part of the brachiocephalicus; this muscle arises from the fusion point of the cleidooccipitalis and the cleidomastiod and inserts on the proximal end of the humerus; it covers the crainial portion of the shoulder joint.
Term
Cleidomastiod
Definition
Part of the brachiocephalicus; the muscle extends from the caudal end of the zygomatic arch of the skull to the shoulder joint.
Term
Cleidooccipitalis
Definition
Part of the brachiocephalicus; this muscle originates from the nuchal crest of the skull and then extends down towards the shoulder.
Term
Pectoralis
Definition
Large triangular muscle covering the ventral surface of the chest.
Term
Latissimus Dorsi
Definition
Large triangular muscle lying caudal to the brachium; it is a major retractor muscle of the arm.
Term
Omotransversarius
Definition
Narrow band-shaped muscle arising from the atlas and following the ventral border of the trapezius; it helps protract the scapula.
Term
Brachiocephalicus
Definition
Muscle located cranial to the trapezius consisting of three band shaed portions; it helps protract the arm
Term
Deltoid
Definition
The muscle located ventral to the insertion of the trapezies; it helps protract the arm.
Term
Pectoralis Profundus
Definition
One of the three muscles of the pectoralis located deep to the pectoralis superficialis; it inserts on the proximal part of the humerus.
Term
Subclavius
Definition
One of the three pectoralis; it originates from the cranial end of the sternum deep to the pectoralis superficialis and inserts on the fascia covering a deep shoulder muscle on the lateral side of the scapula.
Term
Pectoralis Superficialis
Definition
One of three muscles of the pectoralis arising from the cranial half of the sternum and inserting of the humerus medially; it adducts and retracts the arm.
Term
Rhomboideus
Definition
The muscle directly under the trapezius; it inserts on the scapula
Term
Infraspinatus
Definition
Muscle that inserts on the proximal end of the humerus; it rotates the arm outward.
Term
Subscapularis
Definition
This muscle arising from the medial surface of the scapula; and adductor of the arm.
Term
Rhomboideus capitis
Definition
One of the three muscles making up the rhomboideus.
Term
Rhomboideus Cervicis
Definition
One of the three muscles making up the rhomboideus.
Term
Rhomboideus Thoracis
Definition
One of the three muscles making up the rhomboideus.
Term
Supraspinatus
Definition
Muscle that inserts on the proximal end of the humerus; it helps protract the arm.
Term
Teres Major
Definition
Muscle that helps retract the arm; it arises from the caudal border of the scapula and inserts with the latissimus dorsi.
Term
Serratus Ventralis
Definition
Large, fan-shaped muscle that moves the scapula and connects the trunk to the pelvic girdle.
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