Anatomy of the Clavicle

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Questions and Answers

What is the primary function of the clavicle?

To protect the rib cage from impacts

To provide a surface for muscle attachment

To connect the upper limb to the trunk (correct)

To serve as a rigid support for the spine

Which part of the clavicle articulates with the sternum?

The lateral third

The medial third

The sternal end (correct)

The acromial end

The conoid tubercle is important because it provides attachment for which structure?

The acromioclavicular ligament

The rib cage

The conoid ligament (correct)

The pectoralis major muscle

What type of bone comprises the clavicle?

A combination of spongy and compact bone (B) Signup and view all the answers

Which curvature of the clavicle enhances its resilience?

Both the medial and lateral curvatures (D) Signup and view all the answers

How does the clavicle contribute to respiration?

By enabling elevation of the ribs during deep inspiration (B) Signup and view all the answers

What is the significance of the clavicle being subcutaneous?

It allows for easy access in clinical procedures (B) Signup and view all the answers

Which joint does the clavicle form with the scapula?

Acromioclavicular joint (D) Signup and view all the answers

What attaches to the trapezoid line of the clavicle?

Trapezoid ligament (C) Signup and view all the answers

Which fossa of the scapula is larger?

Infraspinous fossa (A) Signup and view all the answers

What is the function of the costoclavicular ligament?

Limits elevation of the shoulder (A) Signup and view all the answers

Where does the subclavius muscle attach on the clavicle?

In the medial third of the shaft (A) Signup and view all the answers

What is the primary purpose of the spine and acromion of the scapula?

To serve as levers for muscle attachment (A) Signup and view all the answers

The triangular body of the scapula is described as having what characteristics?

Thin and translucent superior and inferior to the spine (B) Signup and view all the answers

Which joint is located directly inferior to the acromioclavicular joint?

Glenohumeral joint (B) Signup and view all the answers

What role does the coracoclavicular ligament play in relation to the scapula?

It suspends the scapula from the clavicle (D) Signup and view all the answers

What is the primary function of the glenoid cavity?

To articulate with the head of the humerus (A) Signup and view all the answers

Which feature of the scapula bears the broadened head?

Lateral angle (D) Signup and view all the answers

What distinguishes the medial border of the scapula?

It runs parallel to the thoracic vertebrae (D) Signup and view all the answers

Where is the suprascapular notch located?

At the junction of the medial and lateral thirds of the superior border (C) Signup and view all the answers

What type of joint allows considerable movement of the scapula on the thoracic wall?

Scapulothoracic joint (B) Signup and view all the answers

Which of the following accurately describes the lateral border of the scapula?

It prevents buckling of the scapula under stress. (B) Signup and view all the answers

What does the neck of the scapula define?

The constriction between the head and body of the scapula (C) Signup and view all the answers

Which of the following statements about the coracoid process is correct?

It is bent like a finger pointing towards the shoulder. (A) Signup and view all the answers

Study Notes

Clavicle

Connects the upper limb to the trunk
Has a double curve in a horizontal plane
Medial two-thirds convex anteriorly, sternal end articulates with the manubrium of the sternum at the sternoclavicular (SC) joint
Lateral third flattened and concave anteriorly, acromial end articulates with the acromion of the scapula at the acromioclavicular (AC) joint
Curvatures increase resilience and give it the appearance of an elongated "S"
Acts as a movable, crane-like strut supporting the scapula and free limb, keeping them away from the trunk
Allows the scapula to move on the thoracic wall at the "scapulothoracic joint"
Enables elevation of ribs for deep inspiration
Forms one of the bony boundaries of the cervico-axillary canal, protecting the neurovascular bundle supplying the upper limb
Transmits shocks from the upper limb to the axial skeleton
Subcutaneous and palpable throughout its length, often used as a landmark in clinical procedures
Designated as a long bone, has no medullary cavity, consisting of spongy bone with a shell of compact bone
Superior surface is smooth, lying deep to the skin and platysma muscle in the subcutaneous tissue
Inferior surface is rough with strong ligaments binding it to the 1st rib near the sternal end and suspending the scapula from the acromial end
Conoid tubercle near the acromial end gives attachment to the conoid ligament, the medial part of the coracoclavicular ligament
Trapezoid line also near the acromial end gives attachment to the trapezoid ligament, the lateral part of the coracoclavicular ligament
Subclavian groove in the medial third of the shaft of the clavicle is the site of attachment of the subclavius muscle
Impression for the costoclavicular ligament is a rough, often depressed, oval area that gives attachment to the ligament binding the 1st rib to the clavicle

Scapula

Triangular flat bone lying on the posterolateral aspect of the thorax, overlying the 2nd–7th ribs
Convex posterior surface divided by the spine of the scapula into a small supraspinous fossa and a larger infraspinous fossa
Concave costal surface forms a large subscapular fossa
Three fossae provide attachments for fleshy muscles
Body is thin and translucent superior and inferior to the spine
Spine continues laterally as the flat, expanded acromion, forming the subcutaneous point of the shoulder and articulating with the acromial end of the clavicle
Deltoid tubercle of the scapular spine is the prominence indicating the medial point of attachment of the deltoid
Spine and acromion serve as levers for attached muscles, particularly the trapezius
Suspended from the clavicle by the coracoclavicular ligament
Acromion is a lateral extension, so the AC joint is lateral to the mass of the scapula and its attached muscles
Glenohumeral (shoulder) joint is inferior to the AC joint
Glenoid cavity articulates with the head of the humerus at the glenohumeral joint
Glenoid cavity is a shallow, concave, oval fossa, directed anterolaterally and slightly superiorly
Coracoid process is superior to the glenoid cavity and projects anterolaterally, resembling a bent finger pointing to the shoulder
Has medial, lateral, and superior borders, as well as superior, lateral, and inferior angles
Medial border is parallel to and approximately 5 cm lateral to the spinous processes of the thoracic vertebrae
Lateral border runs superolaterally toward the apex of the axilla
Lateral border terminates at the truncated lateral angle of the scapula
The glenoid cavity is the primary feature of the head
Shallow constriction between the head and body defines the neck of the scapula
Superior border is marked near the junction of its medial two thirds and lateral third by the suprascapular notch
The scapula is capable of considerable movement on the thoracic wall at the physiological scapulothoracic joint, providing the base from which the upper limb operates.

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Description

This quiz delves into the anatomy of the clavicle, its structure, and its essential functions in the upper limb's movement and stability. Learn about its articulations, curvatures, and role as a protective structure for the neurovascular bundle. Enhance your understanding of this critical bone and its clinical significance.