Lab Muscle Anatomy #1

Question 1

Extensive dermal muscle. Especially prominent in the axillary, pectoral, and abdominal regions, will be encountered. This is the muscle in horses that allows them to twitch and get rid of flies, dogs to shake water out of their coats, ect. It is best to remove this muscle with the skin.

Answer 1

Cutaneous Maximus

Question 2

Dermal muscle that adheres closely to the neck and head muscles. It is desirable to remove the platysma with the skin. In the cheek area.

Answer 2

Platysma

Question 3

The most superficial of the chest or pectoral muscles. It is a narrow thin band that extends from the midline of the body to the upper portion of the forelimb.

Answer 3

Pectoantebrachialis

Question 4

Flat, thin band, approximately the same width as the pectoantebrachialis and partially hidden by that muscle.

Answer 4

Pectoralis Major

Question 5

A thick, fan shaped muscle extending caudally to and beneath the deep portion of the pectoralis major. It is also bigger than the pectoralis major.

Answer 5

Pectoralis Minor

Question 6

A long very thin narrow band of muscle lying along the posterior border of the pectoralis minor and according to some anatomists actually part of that muscle.

Answer 6

Xiphihumeralis

Question 7

A longitudinal white line of connective tissue that separates the left and right portions of the abdominal muscles. The sheetlike muscles are thin and quite extensive, supporting the entire abdominal area and a portion of the ventral thoracic region. These muscles are layered and adhere closely to one another by means of fascia. The direction of fibers within each sheet is distinctive and this feature is used as a tool to identify the individual muscles.

Answer 7

Linea Alba

Question 8

The direction of the fibers of this muscle extend craniodorsally. This is the most superficial of the three sheetlike abdominal muscles.

Answer 8

External Oblique

Question 9

The direction of the fibers of this muscle extend caudodorsally. This sheetlike muscle lies directly beneath the external oblique.

Answer 9

Internal Oblique

Question 10

Fibers of this muscle sheet extend nearly transversely between the origin and insertion. This muscle sheet lies directly beneath the internal oblique.

Answer 10

Transversus Abdominis

Question 11

This muscle occurs as a longitudinally directed band of muscle on either side of the linea alba. This muscle is encased in a sheath formed by the aponeuroses of the other three abdominal muscles.

Answer 11

Rectus Abdominis