Lecture 4: Back Myology Flashcards Preview

Year 1: 03. MSK Exam 1 > Lecture 4: Back Myology > Flashcards

Flashcards in Lecture 4: Back Myology Deck (37)
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1

What is an aponeurosis?

White fibrous tissue that takes place of a tendon in flat muscles having a wide area of attachment

2

What are pennate muscles?

Defines where muscles are

Unipennate: Muscles are one side of tendon

Bipennate: Muscles on both sides

Multipennate: Muscles all over the place

3

What does "fusiform" mean?

Muscles are big in the middle, small on the ends

4

What are digastric muscles?

2 muscle bellies connected by tendon

5

What are multiventral muscles?

Muscles with tendinous inscriptions?

Example: Rectus Abdominis 

6

What makes multicaudal muscles unique?

Multiple tendons (looks like tails)

Common in extremities (fingers and toes)

7

Where do serrated muscles attach?

The ribs.

8

Functionally, what do Agonists do?

Flex a joint

9

Functionally, what do Antagonists do?

Extend a joint

10

What do Synergist muscles do?

Assists the agonists

11

What is the action of the trapezius muscle?

Whole Muscle: Retracts the scapula and Rotates glenoid cavity superiorly

Superior Part: elevate scapula

Inferior Part: depress scapula 

Scapula fixed: Extend neck (bilaterally), Laterally flex neck and rotate face away (unilaterally) 


 

12

What is the innervation and blood supply for the trapezius muscle?

Innervation: Spinal Accessory Nerve (CN XI)

Blood Supply: Transverse Cervical Artery

13

What is the action of the latissimus dorsi?

Extends and adduct humerus

Medially rotate humerus 

Rotate glenoid cavity inferiorly 

14

What is the innervation and blood supply for Latissimus Dorsi?

Innervation: Thoracodorsal Nerve

Blood Supply: Thoracodorsal Artery

15

What is the action of the rhomboid major and minor?

Retract scapula

Elevate scapula 

Rotate glenoid cavity inferiorly 

16

What is the action of levator scapulae

Retract scapula

Elevate Scaupla 

Rotate glenoid cavity inferiorly 

With Scapula Fixed:

Extend neck bilaterally 

Laterally flex neck unilaterally

17

What is the innervation and blood supply for Rhomboid Minor, Rhomboid Major and Levator Scaupluae?

Innervation: Dorsal Scapular Nerve

Blood Supply: Dorsal Scapular Artery

18

What is the action of the Serratus Posterior Superior muscle?

Elevates rib (for inspiration) 

Proprioception 

19

What is the innervation and blood supply for Serratus Posterior Superior?

Innervation: Intercostal Nerve

Blood Supply: Posterior Intercostal Artery

20

What is the action of Serratus Posterior Inferior muscle?

Depresses rib (for expiration) 

Proprioception 

21

What is the innervation and blood supply for Serratus Posterior Inferior muscle?

Innervation: Anterior Ramus of T9-12

Blood Supply: Posterior Intercostal Arteries

22

What is the action of Splenius Capitis and Splenius Cervicis?

Extends neck bilaterally

Laterally flexes the neck unilaterally

Rotates the face towards the muscle unilateraly

23

What is the innervation and blood supply of Splenius Capitis and Cervicis?

Innervation: Posterior Rami

Blood Supply: Deep Cervical Artery

24

In general, what is the action of the erector spinae muscles?

Maintain erect posture

Extend and laterally flex vertebral column and neck

25

What is the innervation and blood supply of erector spinae muscles?

Innervation: Posterior rami

Blood Supply: Deep Cervical Artery/Intercostal artery

26

What are the three segments of Iliocostalis Muscle?

Iliocostalis Lumborum (only Lumborum)

Iliocostalis Thoracis

Iliocostalis Cervicis

27

What are the three segments for Longissimus?

Longissimus Thoracis (largest)

Longissimus Cervicis

Longissimus Capitis (Inserts at the Mastoid process, to help locate it)

28

What are the three segments for Spinalis?

Spinalis Thoracis (Often confusible with Longissimus because it is small)

Spinalis Cervicis (Can't see)

Spinalis Capitis (Can't see)

29

What is damaged in a back strain?

What is damaged in a back sprain?

strain is damage to a muscle fiber by excessive stretching of a muscle due to contraction. (think tendon)

sprain is injury to the ligamentous attachment between bones. (think ligament)

Remember that a sprained ankle has nothing to do with muscles.

30

What are the four types of Transversospinalis muscles?

How far (in number of vertebrae) does each one go up?

Semispinalis (5-6)

Multifidus (3-4)

Rotatores Longus (2)

Rotatores Brevis (1)