Pectoral Girdle - Clavicle Flashcards
What shape is the clavicle?
S-shaped
What is another name for the sternal end?
Medial end/extremity
What is aother name for the acromial end?
Lateral end/extremity
What end of the clavicle is round and what end is flatter?
Round: sternal end
Flat: acromial end
What surface has topography, inferior or superior, and why?
Inferior surface as it is the reverse of rib 1 so it had the subclavian vessels running along its surface
How does the clavicle act as a ‘strut’?
By holding the glenohumeral joint in the parasagittal plane
What are the functions of the clavicle?
Act as a strut
Weight bearing/transmit weight
protects auxillary neurovascular bundle along its course from neck to upper limb
What does the clavicle articulate with at the acromial end?
Scapula
What does the clavicle articulate with at the sternal end?
Manubrium/sternum
Where is the trapezoid line/ridge and what attaches here?
On the inferior surface near the acromial end
Trapezoid ligament attaches here
Where is the conoid tubercle and what attaches here?
On the inferior surface near the acromial line
Conoid ligament attaches here
What groove/sulcus is on the inferior surface?
Subclavian
What is the nutrient foramen?
A small hole where nutrients can enter the bone
What tuberosity is on the sternal end/inferior surface?
Costal tuberosity (is an impression for costoclavicular ligament)
What articular surface is closer to the sternal end?
1st costal cartilage articular surface
Name the borders and surfaces
Anterior and posterior borders
Superior and Inferior surfaces
Name the 2 curvatures
Medial curvature (takes up 2/3rds of clavicle) Lateral curvature (takes up 1/3rd of clavicle)
Where is thr nutrient foramen usually found?
Medial 2/3rds
Is the nutrient foramen single?
It can be single or double - usually single
What originates from the costal tuberosity and inserts into the 1st rib?
costoclavicular ligment
Describe origin and insertion of pectoralis major
Origin: anterior medial clavicle (and sternum)
Insertion: lateral lip of bicipital groove of humerus
Decribe the movements produced by pectoralis major
Adduction, medial rotation and flexion of arm
Decribe origin and insertion of sternohyoid
Origin: posterior medial clavicle (and manubrium)
Insertion: hyoid
Describe the movement of sternohyoid
depresses hyoid
