WEEK 2: Minor Deep Back Muscles

Question 1

Minor Deep Back Muscles (3) in addition to the layers

Answer 1

Interspinalis
Intertransversails
Levator Costae - longus & brevis

Question 2

Transversospinalis layer and referred name?

Answer 2

Layer 6

transverso - spinalis: muscles that fill the space between the transverse process and the spinous process

(Deep intrinsic)

Question 3

What muscles connect to transversospinalis

Answer 3

Inter-trans-versarius
Rotator
Multifidus
Semispinalis
Spinalis

Question 4

Interspinales

Answer 4

extends from one spinous process to adjacent SP

Helps extend the spine

Question 5

Intertransversarii

Answer 5

extends from one transverse process to an adjacent TP

-helps with ipsilateral lateral flexion

Question 6

ipsilateral lateral flexion

Answer 6

Lateral flexion simply means bending a body part (waist or neck) to the left or right. Here is lateral flexion of the neck. Ipsilateral means “on the same side.” (The opposite anatomical term is contralateral.)

Question 7

Levator Costarum - Longus & Brevis: Origin, Insertion, Innervation, Action, Blood Supply

Answer 7

Longus - long muscle
Brevis - short muscle

Origin
- distal TPs C7-T11

Insertion
- superior border of ribs, between tubercle and angle

Innervation
- dorsal rami of C8-T11 spinal nerve

Action
- costovertebral elevation

Blood Supply

Question 8

Longus & Brevis

Answer 8

means how many ribs are involved

Fibularis brevis, or peroneus brevis, is a short muscle that together with the fibularis (peroneus) longus comprises the group of the lateral leg muscles

Question 9

Tubercle

Answer 9

a small rounded point of a bone

Question 10

Tubercle vs tuberosity

Answer 10

Tuberosity: A moderate prominence where muscles and connective tissues attach.

Tuberosities function similarly to trochanters. Examples include the tibial, deltoid, and ischial tuberosities.

Tubercle: A small, rounded prominence where connective tissues attach

Question 11

Nerve Supply to the Muscles of the Back

Answer 11

Trapezius - CN 11 spinal accessory, C3-C4

Latissimus Dorsi - thoracodorsal (C6-C8)

Levator scapulae - C3-C4, dorsal scapular n. (C5)

Rhomboid Ma & Mi - dorsal scapular n. (C5)

Serratus Posterior Superior - intercostal n. T2-T5

Serratus Posterior Inferior - intercostal T9-T12

Splenius Capitus - dorsal rami C3-C5

Splenius Cervicis - dorsal rami C5-C7

Layer 5, 6 and Small deep - dorsal rami of spinal nerves at respective levels