Muscles of the Back (Deep Muscles)

Question 1

Erector Spinae (Origins)

A) Illicostalis Lumborum, Thoracis, Cervicis
B) Longissimus Thoracis, Cervicis, Capitis
C) Spinalis Thoracis and Cervicis

Answer 1

Sacrum, Spinous process of lumbar and lower two thoracic vertebrae and their supraspinous ligaments and the iliac crest

Question 2

Erector Spinae (Insertions)

A) Illicostalis Lumborum, Thoracis 
B) Illicostalis Cervicis 
C) Longissimus Thoracis
D) Longissimus Cervicis
E) Longissimus Capitis 
F) Spinalis Thoracis 
G) Spinalis Cervicis

Answer 2

A) Illicostalis Lumborum, Thoracis: Ribs
B) Illicostalis Cervicis: Transverse process of cervical vertebrae
C) Longissimus Thoracis: Transverse process of thoracic vertebrae
D) Longissimus Cervicis: Transverse process of Cervical verterbrae
E) Longissimus Capitis: Mastoid Process
F) Spinalis Thoracis: Spinous process of thoracic vertebrae
G) Spinalis Cervicis: Spinous process of C2

Question 3

Transversospinales (Origins, Insertions, Innervations, Action)

A) Semispinalis
B) Multifudus
C) Rotatores

Answer 3

Origin: Transverse process
Insertion: Spinous process
Innervation: Posterior Rami of the spinal nerves

A) Action: Extends and contralaterally rotates the head and vertebral column

B) Action: Stabilizes the vertebral column

C) Action: Stabilizes the vertebral column