Lecture 10: Upper Extremity Myology Flashcards Preview

Year 1: 03. MSK Exam 1 > Lecture 10: Upper Extremity Myology > Flashcards

Flashcards in Lecture 10: Upper Extremity Myology Deck (150)
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1

Pectoralis Major M.

What are the attachments?

Origin: Claviclular Head, Sheath of Rectus Abdominis, Clavical, Sternum

Insertion: Lateral Edge of the Intertubercular Groove of Humerus

(covers the long head of Biceps Brachii M)

2

Pectoralis Major M.

What are the major actions?

1. Adduct and Medially Rotate Humerus

2. Protract and Depress Scapula

3. Clavicular Head: Flex Humerus

4. Sternocostal Head: Extend Humerus from flexed state

 

 

3

Pectoralis Major M.

What is the innervation and blod supply?

Innervation: Lateral and Medial Pectoral Nerve

Blood Supply: Pectoral Branch of the Thoracoacromial Trunk

4

Pectoralis Minor M.

What are the attachments?

Origin: Medial aspect of Ribs 3-5

Insertion: Coracoid Process of the Scapula

5

Pectoralis Minor M.

What is the action?

Stabilizes the Scapula by holding it to thoracic wall

6

Pectoralis Minor M.

What is the innervation and blood supply?

Innervation: Medial Pectoral Nerve

(It gets pity innervated on the way to the Pectoralis Major M.)

Blood Supply: Pectoral Branch of the Throacoacromial Trunk

7

Subclavius M.

What are the attachments?

Origin: Upper border of 1st rib and 1st Costal Cartilage

Insertion: Inferior aspect of the Clavicle

8

Subclavius M.

What is the Action?

Depresses the Clavicle

9

Subclavius M.

What is the innervation and blood supply?

Innervation: Nerve to the Subclavius

Blood Supply: Clavicular Branch of the Thoracoacromial Trunk

10

Serratus Anterior M.

What are the attachments?

Origin: Lateral external surface of Ribs 1-8

Insertion: Anterior surface of medial border of scapula 

 

11

Serratus Anterior M.

What are the actions?

1. Protraction of the Scapula

(Boxer's Serratus Anterior Muscles are buff for this reason)

2. Superior Rotation of the Glenoid Cavity

(Pulls the medial border down towards the ribs - lateral end goes up)

3. Stabalizes the Scapula by pulling it to the Thoracic Wall

12

Serratus Anterior M.

What is the innervation and blood supply?

Innervation: Long Thoracic Nerve

Blood Supply: Lateral Thoracic Artery

13

If the Serratus Anterior or Long Thoracic Nerve is damaged, what can it cause and what motion does this prevent?

"Winging" of the Scapula

-Scapula is no longer Stabalized against the Thoracic Wall

-Abduction of the Upper Extremity beyond the Horizontal Position

14

Deltoid Muscle

What are the Attachments?

Origin: Lateral Clavicle, Scapular Spine, and Acromion

Insertion: Deltoid Tuberosity of the Humerus

15

Deltoid Muscle

What are the actions?

Anterior Part: Flex and Medial Rotation of the Humerus

Middle Part/Whole Muscle: Abduction of the Humerus

Posterior Part: Extension of the Shoulder and Lateral Rotation of the Humerus

16

Deltoid Muscle

What is the innervation and blood supply?

Innervation: Axillary Nerve

Blood Supply: Posterior Circumflex Humeral Artery (main)

Deltoid Branch of Thoracoacromial Artery

 

17

Subscapularis Muscle

What are the attachments?

Orign: Medial Aspect Subscapular Fossa

Insertion: Lesser Tubercle of the Humerus

18

Subscapularis Muscle

What are its actions?

1. Medial Rotation of the Humerus

2. Adduction of the Humerus

3. Holds humeral head in glenoid cavity

19

For the Subscapularis M.

What is the innervation and blood supply?

Innervation: Upper and Lower Subscapular Nerve

Blood Supply: Subscapular Artery

20

Supraspinatus Muscle

What are the attachments?

Origin: Supraspinous Fossa of the Scapula

Insertion: Greater Humeral Tubercle (running over the superior-most part of the Humerus)

21

Supraspinatus Muscle

What is the action?

1. Abduction of the Humerus (along with deltoids)

2. Holds Humeral Head in Glenoid Cavity

22

Supraspinatus Muscle

What is the innervation and blood supply?

Innervation: Suprascapular Nerve

Blood Supply: Suprascapular Artery

23

Infraspinatus Muscle

What are the attachments?

Origin: Infraspinous Fossa of Scapula

Insertion: Greater Tubercle of the Humerus

24

Infraspinatus Muscle

What is its action?

1. Lateral Rotation of the Humerus

2. Holds Humeral Head in Glenoid Cavity

25

Infraspinatus Musle

What is the innervation and blood supply?

Innervation: Suprascapular Nerve

Blood Supply: Suprascapular Artery and Circumflex Scapular Artery

(The Circumflex Scapular Artery comes around the lateral border of the scapula and heads superiorly and medially)

26

Teres Minor Muscle

What are the attachments?

Origin: Middle Part of Lateral Border of Scapula

Insertion: Greater Tubercle of Humerus

27

Teres Minor Muscle

What are its actions?

1. Laterally Rotates Humerus

2. Holds Humeral Head in Glenoid Cavity

28

Teres Minor Muscle

What is the innervation and blood supply?

Nerve: Axillary Nerve

Blood Supply: Circumflex Scapular Artery and Subscapular Artery

29

Teres Major Muscle

What are the attachments?

Origin: Posterior aspect of Inferior Angle of the Scapula

Insertion: Medial edge of Intertubercular groove

(Front of the Humerus)

30

Teres Major Muscle

What are the actions?

1. Medial rotation of the Humerus

(Pulls the front of the Humerus medially)

2. Adduction of the Humerus