this lecture about pectoral region muscles, fascia, and related anatomical structures.

3. Learning outcomes of lecture 2
• Recognizing the role of muscles of pectoral region in
stabilizing the pectoral girdle
• Listing the muscles of the pectoral region.
• Describing and demonstrating the attachments of
muscle of pectoral region , nerve supply and actions.
• Describing the structural organization of clavi
pectoral fascia.

5. The pectoral region is located on the
anterior chest wall.

6. 4 muscles:
3 Layers of fascia:
1- pectoralis major.
2- pectoralis minor.
3- sub clavius.
4- serratus anterior.
1- superficial fascia.
2- deep fascia.
3- clavipectoral fascia.
Deep to the skin, contains the breast
Covers the pectoralis major
Between pectoralis minor and subclavius.

7. • Ribs
• Clavicle,
• Sternum
• scapula
7

8. Clavicle
It is classed as a long bone and can be palpated
along its length.
In thin individuals, it is visible under the skin.

9. The clavicle extends between:
manubrium of the sternum
acromion of the scapula.

10. Also called collar bone

11. The clavicle has three main functions:
• Attaches the upper limb to the trunk as part
of the ‘shoulder girdle’.
• Protects the underlying neurovascular
structures supplying the upper limb.
• Transmits force from the upper limb to the
axial skeleton.

12. ‘S’ shape, Facing forward, the medial
aspect is convex, and the lateral aspect
concave.
sternal end
acromial end.
shaft

13. The sternal end contains a large facet – for
articulation with the manubrium of the
sternum at the sternoclavicular joint.

14. Type of
sternocavicular joint

15. Muscle Attachments to Shaft of clavicle
Anterior border: pectoralis major
Posterior border: sternocleidomastoid muscle (clavicular
head),
trapezius
Superior surface: deltoid muscle
inferior surface: subclavius muscle

16. Lateral end of clavicle houses a small facet
for articulation with the acromion of the
scapula at the acromioclavicular joint.

17. Type of
acrmiocavicular
joint

18. Acromial (lateral) End
Conoid tubercle –
attachment point of the
conoid ligament
Trapezoid line – attachment
point of the trapezoid
ligament

19. conoid ligament, the medial part
of the coracoclavicular ligament.
trapezoid ligament, the lateral part of
the coracoclavicular ligament.

20. Ligaments attached to the clavicle

21. 5 differences between the clavicle
and other long bones
1- it lies horizontally.
2- it has no medullary cavity.
3- it is the first bone to ossify in the fetal
life (5th week).
4- it ossifies in membrane ( membranous
ossification not cartilaginous).
5- it is the commonly fractured bone.

22. Clinical correlation
Fracture of the Clavicle

26. 26

27. Pectoralis Major
• Origin: Medial half of clavicle, sternum, upper
6 costal cartilages
• Insertion: Lateral lip of bicipital groove of the
humerus
• Nerve Supply : brachial plexus
• Action: Adducts the arm and rotates it
medially, some fibers also cause flexion of arm

28. •Origin: Medial half of
clavicle, sternum, upper 6
costal cartilages
•Insertion: Lateral lip
of bicipital groove of
the humerus

29. Deltopectoral
groove…
where?
Content?

30. Subclavius muscle
• Origin: From the first costal cartilage
• Insertion: inferior surface of clavicle
• Nerve Supply : brachial plexus
• Action: Depresses the clavicle and steadies the
bone

31. •Origin: From the first costal cartilage
•Insertion: inferior surface of clavicle

32. Pectoralis Minor
• Origin: From 3rd, 4th and 5th ribs
• Insertion: Coracoid Process of the scapula
• Nerve supply : brachial plexus
• Action: Pulls the shoulder downward and
forward. Elevates the ribs of origin

33. Origin: From 3rd, 4th and 5th rib
•Insertion: Coracoid Process of the
scapula

34. Serratus Anterior
• Origin: From Outer surface of upper 8 ribs
• Insertion: Medial border of scapula in the
region of inferior angle
• Nerve Supply: Long thoracic nerve
• Action: Draws the scapula forward, rotates it

35. •Origin: From Outer surface of upper 8
ribs
•Insertion: Medial border
of scapula in the region
of inferior angle

37. 37

38. Winging of scapula due to long
thoracic nerve injury
38

40. Thoracopectoral fascia is a strong fascia
situated under cover of the clavicular
portion of the pectoralis major.
It occupies the interval between the
pectoralis minor and subclavius,
and protects the axillary vessels and
nerves

41. • Pierced by :
• Thoracoacromial artery.
• Cephalic vein
• Lateral pectoral nerve
• Lymphatics

42. Reaching ???
• Recognizing the role of muscles of pectoral region in
stabilizing the pectoral girdle
• Listing the muscles of the pectoral region.
• Describing and demonstrating the attachments of
muscle of pectoral region , nerve supply and actions.
• Describing the structural organization of clavi
pectoral fascia.

44. Identify this muscle?

45. Identify this muscles?

46. Identify the following in cadaver

48. Deadline :
On Tuesday
Jan, 17

49. t.me/BMS2020_AMEERAALHUMIDI
@Dr_Ameeraalhumidi
ameeraalhumidi@gmail.com