Unit II: Muscular System

Question 1

Develops from ___

Answer 1

Mesoderm

Question 2

Exceptions of muscular system mesoderm

Answer 2

1. eye

2. mammary glands and sweat glands

Question 3

3 types of muscle

Answer 3

1. skeletal-> paraxial mesoderm
2. smooth-> splanchnic mesoderm
3. splanchnic mesoderm

Question 4

What does epaxial mean?

Answer 4

Dorsally

Question 5

What does hypaxial mean?

Answer 5

Ventrally

Question 6

Posterior primary ramus supplies the ___ division

Answer 6

Epaxial

Question 7

Anterior primary ramus supples the ___ division

Answer 7

Hypaxial

Question 8

What do myoblasts from the epaxial division give rise to?

Answer 8

Extensor muscles of the neck and vertebral column, sacrococcygeal ligaments

Question 9

Hyapxial derivatives of the cervical region

Answer 9

Scalene, geniohyoid, infrahyoid, pre vertebral muscles

Question 10

Hypaxial derivatives of the thoracic region

Answer 10

Intercostal muscles, muscles of the anterior abdominal wall

Question 11

Hypaxial derivatives of the lumbar region

Answer 11

Quadratus lumborum muscle

Question 12

Hypaxial derivatives of the sacral and coccygeal region

Answer 12

Pelvic diaphragm, external anal sphincter, perineal muscles

Question 13

Myoblasts fro the pharyngeal arches give rise to muscles of:

Answer 13

1. mastication
2. facial expression
3. pharynx
4. larynx

Question 14

Where are tongue muscles derived from?

Answer 14

Second-fourth occipital myotomes

Question 15

Where is smooth muscle in the gut derived from?

Answer 15

Splanchnic mesoderm surrounding the endoderm

Question 16

Where is smooth muscle in the walls of blood and lymph vessels derived from?

Answer 16

Somatic mesoderm adjacent to the endothelium

Question 17

Cardiac muscle develops from ___

Answer 17

Splanchnic mesoderm