1.4.1. Structure of the Glenohumeral Joint and Proximal Humerus Flashcards Preview

3rd Year - MSK Upper Limb Anatomy > 1.4.1. Structure of the Glenohumeral Joint and Proximal Humerus > Flashcards

Flashcards in 1.4.1. Structure of the Glenohumeral Joint and Proximal Humerus Deck (28)
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1
Q

What is the name of the cavity which lies on the lateral surface of the Scapula?

A

The Glenoid Cavity

2
Q

What articulates with the Glenoid Cavity?

A

The Head of the Humerus

3
Q

What type of joint is the Glenohumeral Joint?

A

A Ball and Socket Joint

4
Q

What is the “Ball” in the Glenohumeral Joint?

A

The Head of the Humerus

5
Q

What is the “Socket” in the Glenohumeral Joint?

A

The Glenoid Cavity

6
Q

What is the name of the Cartilage surrounding the Glenoid Cavity?

A

The Glenoid Labrum

7
Q

What is the function of the Glenoid Labrum?

A

This elevated the Glenoid edge, doubling the Glenoid depth and increasing its surface area.
This results in the “Ball” (Head of the Humerus) staying in place

8
Q

What is a Tubercle? And what does it signify?

A

It is a round Nodule which signifies an attachment site of a muscle / ligament

9
Q

How many Tubercles does the Humerus have?

A

2

10
Q

What are the names of the 2 Tubercles of the Humerus?

A
  1. The Greater Tubercle

2. The Lesser Tubercle

11
Q

What connects the Head of the Humerus, to the 2 Tubercles of the Humerus?

A

The Anatomical Neck

12
Q

Where is the Greater Tubercle located on the Humerus?

A

Laterally

13
Q
  1. How many face(s) does the Greater Tubercle have?

2. What are they?

A
  1. 2
  2. a) Anterior Face
  3. b) Posterior Face
14
Q

What is the function of the Greater Tubercle?

A

It serves as an attachment for 3 Rotator Cuff Muscles

15
Q

What are the 3 Rotator Cuff Muscles which attach onto the Greater Tubercle?

A
  1. Supraspinatus
  2. Infraspinatus
  3. Teres Minor
16
Q

Where is the Lesser Tubercle located on the Humerus?

A
  1. Medially to the Greater Tubercle

2. Laterally to the Head of the Humerus

17
Q
  1. How many face(s) does the Lesser Tubercle have?

2. What are they?

A
  1. 1

2. Anterior Face

18
Q

What is the function of the Lesser Tubercle?

A

It severs as an attachment place for the Subscapularis Muscle (the final Rotator Cuff Muscle)

19
Q

What separates the 2 Tubercles?

A

The Intertubercular Sulcus (Groove)

20
Q

What runs through the Intertubercular Sulcus?

A

The Tendon of the Long Head of the Biceps Brachii

21
Q

What are the Edges of the Intertubercular Sulcus known as?

A

Lips

22
Q

What attaches onto the Lips of the Intertubercular Sulcus?

A

Tendons of the:

  1. Pectoralis Major
  2. Teres Major
  3. Latissimus Dorsi
23
Q

How many “Necks” of the Humerus are there?

A

2

24
Q

What are the names of the Necks of the Humerus?

A
  1. The Anatomical Neck

2. The Surgical Neck

25
Q

Where is the Surgical Neck of the Humerus located?

A

This runs from the Tubercles to the Shaft of the Humerus

26
Q

What are both surfaces of the Glenohumeral Joint covered in?

A

Hyaline Cartillage

27
Q

Which is larger, the Head of the Humerus, or the Glenoid Fossa?

A

The Head of the Humerus

28
Q

What is the Clinical Significance of the Head of the Humerus being larger than the Glenoid Fossa?

A

It means the joint has inherent instability

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