BM 1041:03 Lecture Notes - Lecture 19: Clavicle, Shoulder Girdle, Triceps Brachii Muscle
23 May 2018
School
Department
Course
Professor
Upper limb is associated with lateral aspect of lower portion of the neck
-
Suspended from trunk by muscles and sternoclavicular joint between the clavicle and the sternum
-
Shoulder - area of the upper limb attachment to the trunk via the pectoral girdle
○
Arm
○
Forearm
○
Girdle
○
Upper limbs made up of
-
Positions the hand
-
Highly mobile
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Flex/ext
○
Ab/adduction
○
Medial/lateral rotation
○
circumduction
○
Glenohumeral joint allows arm to move around 3 axes with wide range of motion
-
Describe and demonstrate the main anatomical landmarks of the
clavicle, scapula, and proximal humerus.
Describe the anatomy of the pectoral girdle (clavicle and scapula)
including the acromioclavicular joint and the sternoclavicular joint
and their associated ligaments as well as the association of the
scapula with the thoracic cage.
Shoulder complex
Screen clipping taken: 24/04/2018 7:43 PM
Bones
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Clavicle
acts as struct, holds
upper limb away from
trunk
-
Only bony attachment
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L1 - Pectoral girdle
Tuesday, 24 April 2018
7:30 PM
Wk 9 Page 1
Only bony attachment
between trunk and
upper limb
-
Facet for
articulation with
acromion of
scapula
Acromial/lateral end =
flat
-
Larger facet for
articulation with
manubrium of
sternum and
costal cartilage
Sternal/medial end =
more quadrangular
-
On inferior surface
of lateral third of
the clavicle
Conoid tubercle
-
Attachment of
coracoclavicular
ligament
Trapezoid line
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Roughening =
attachment of
muscles
Superior surface
smoother than inferior
-
Sternum medially
at the
sternoclavicular
joint
Scapula laterally at
the
acromioclavicular
joint
Articulates with
-
Screen clipping taken: 24/04/2018 7:45 PM
Scapula
scapula has no true
anatomical joint,
attached on thorax via
muscles
-
overlaps 2nd to 7th ribs
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Suspended in muscles
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Held in position by
clavicle
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Has great mobility across
thorax
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Acromion has small
articular facet for
clavicle
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Large, flat triangular
bone
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Marked by
Lateral
•
3 angles
-
Screen clipping taken: 24/04/2018 7:48 PM
Wk 9 Page 2
Marked by
glenoid
cavity ,
which
articulates
with head of
humerus to
form GH
joint
○
Infraglenoid
tubercle -
site of
attachment
for long
head triceps
brachii
○
Supraglenoi
d tubercle
attaches to
long head of
biceps
brachii
○
Superior
•
Inferior
•
Thin and
sharp
○
Marked on
lateral end
by coracoid
process and
suprascapul
ar notch
○
Superior
•
Strong, thick
for muscle
attachment
○
Lateral
•
Thin and
sharp
○
Medial
•
3 borders
-
Shallow
subscapular
fossa
○
Muscle
attachment
○
Costal
•
Posterior
•
2 surfaces
-
Arches over
glenoid
cavity
○
Articulates
with clavicle
○
Acromion
•
Subdivides
Spine
•
3 processes
-
Screen clipping taken: 24/04/2018 7:49 PM
Screen clipping taken: 24/04/2018 7:53 PM
Screen clipping taken: 24/04/2018 7:51 PM
Wk 9 Page 3
Document Summary
Upper limb is associated with lateral aspect of lower portion of the neck. Suspended from trunk by muscles and sternoclavicular joint between the clavicle and the sternum. Shoulder - area of the upper limb attachment to the trunk via the pectoral girdle. Glenohumeral joint allows arm to move around 3 axes with wide range of motion. Describe and demonstrate the main anatomical landmarks of the clavicle, scapula, and proximal humerus. Describe the anatomy of the pectoral girdle (clavicle and scapula) including the acromioclavicular joint and the sternoclavicular joint and their associated ligaments as well as the association of the scapula with the thoracic cage. Clavicle acts as struct, holds upper limb away from trunk. Only bony attachment between trunk and upper limb. Larger facet for articulation with manubrium of sternum and costal cartilage. On inferior surface of lateral third of the clavicle. Scapula scapula has no true anatomical joint, attached on thorax via muscles overlaps 2nd to 7th ribs.
