Clavicle Flashcards
How many bones are in the upper limbs of a human?
The upper limbs contain as many as 64 bones.
How many bones need to be learned for the upper limbs?
One needs to learn only 32 bones out of a total of 64 bones.
What is the clavicle also known as?
The clavicle is known as ‘a small key’ in Latin.
What is the primary function of the clavicle?
It supports the shoulder so that the arm can swing clearly away from the trunk.
What are the two ends of the clavicle called?
The two ends are called the lateral end and the medial end.
How can the side of a clavicle be determined?
The lateral end is flat, and the medial end is large and quadrilateral.
What is a unique feature of the clavicle’s shaft?
The shaft is slightly curved, convex forwards in its medial two-thirds, and concave forwards in its lateral one-third.
What is a peculiar feature of the clavicle?
It is the only long bone that lies horizontally.
What is the first bone to start ossifying?
The clavicle is the first bone to start ossifying.
What does the clavicle transmit?
The clavicle transmits the weight of the limb to the sternum.
What is the significance of the conoid tubercle?
It is an elevation on the inferior surface of the clavicle’s lateral one-third.
What is the acromial end of the clavicle?
The lateral end is flattened from above downwards and bears a facet that articulates with the acromion process of the scapula.
What is the shape of the medial or sternal end of the clavicle?
Quadrangular
The medial end articulates with the clavicular notch of the manubrium sterni to form the sternoclavicular joint.
What joint is formed by the articulation of the medial end of the clavicle?
Sternoclavicular joint
The medial end articulates with the clavicular notch of the manubrium sterni.
What is located at the lateral end of the clavicle?
Acromioclavicular joint
The margin of the articular surface at the lateral end gives attachment to the joint capsule.
What structures attach to the medial end of the clavicle?
- Articular disc posterosuperiorly
- Fibrous capsule of sternoclavicular joint all around
- Interclavicular ligament superiorly
These attachments are important for the stability of the sternoclavicular joint.
Which muscles originate from the anterior surface of the clavicle?
- Pectoralis major
- Clavicular head of sternocleidomastoid
The anterior surface of the clavicle plays a significant role in muscle attachment.
What is the function of the trapezoid ridge and conoid tubercle on the clavicle?
Attachment for the coracoclavicular ligament
These structures provide stability to the acromioclavicular joint.
What ligament attaches to the impression for costoclavicular ligament?
Costoclavicular ligament
This ligament connects the first rib to the clavicle.
The lateral one-third of the shaft of the clavicle allows for attachment of which muscle?
Deltoid
The anterior border of the lateral one-third gives origin to the deltoid muscle.
True or False: The posterior border of the medial two-thirds of the clavicle provides insertion to the trapezius muscle.
False
The posterior border of the medial two-thirds provides insertion to the trapezius muscle.
Fill in the blank: The lateral end of the clavicle articulates with the _______.
Acromion
This articulation forms the acromioclavicular joint.
What is the main role of the clavicle in the upper limb?
Acts as a strut
The clavicle connects the arm to the body trunk, providing support and stability.
What gives attachment to the costoclavicular ligament?
The oval impression on the inferior surface at the medial end
This is located on the clavicle.
