Questions and Answers
What does the clavicle primarily connect?
Which characteristic of the clavicle is TRUE regarding its physical properties?
What is the significant functional role of the clavicle?
Which description accurately reflects the shape of the clavicle?
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What does the term 'sternal extremity' refer to in relation to the clavicle?
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Which muscle group is primarily responsible for the stabilization of the shoulder joint?
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What are the boundaries of the cubital fossa?
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Which artery is a major vessel supplying the upper limb?
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The anatomical snuffbox contains which key structure?
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What is the primary function of the muscles in the rotator cuff?
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Which structure is NOT part of the brachial plexus?
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What movement is primarily facilitated by the intrinsic muscles of the hand?
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What is the major lymphatic drainage pathway for the breast?
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Which of the following best describes the fibrous digital sheaths?
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Which structure is primarily identified with the boundaries of the axilla?
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Which nerve primarily affects the ability to abduct the arm at the shoulder joint?
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What is the anatomical term for the condition of the humeral head being displaced downward beneath the coracoid process?
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Which sensory region is likely affected due to damage to the radial nerve?
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In a subcoracoid dislocation, which muscle is particularly affected by the position of the humeral head?
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Which type of joint is the glenohumeral joint?
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Which part of the upper limb is innervated by the axillary nerve?
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Which artery primarily provides blood supply to the shoulder region?
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What condition can result from injury to the musculocutaneous nerve?
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What is the primary function of the clavicle in relation to the upper limb?
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Which part of the clavicle is most commonly fractured?
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Which muscle is responsible for tilting the medial end of the clavicle upwards after a fracture?
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Which of the following structures is NOT a defining feature of the scapula?
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What is the effect of a clavicular fracture on the lateral fragment?
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What condition may result from narrowing of the interval between the clavicle and the first rib?
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Which structure typically passes superior to the superior transverse scapular ligament?
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What may happen due to involvement of the supraclavicular nerves after a clavicle fracture?
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Study Notes
Clavicle
- Known as the "collar bone"; Latin term "clavicle" means "key."
- Located horizontally at the root of the neck, connecting the sternum and scapula.
- S-shaped structure providing support and movement for the upper limb relative to the trunk.
- First bone to begin ossification; subcutaneous and easily palpable throughout.
- Sternal extremity is the thickened proximal end that articulates with the sternum.
Case Study Overview
- A 64-year-old woman experienced severe left shoulder pain after falling down stairs.
- Inspections revealed swelling and altered shoulder curvature.
- Sensory deficits were noted in various areas of the left upper limb, indicating potential nerve damage.
- Diagnosed with subcoracoid dislocation of the shoulder, affecting the axillary and radial nerves.
- Diagnosis required extensive knowledge of shoulder anatomy and nerve distribution.
Upper Limb Anatomy
- Osteology: Includes bones like the clavicle, scapula, humerus, radius, ulna, carpal bones, metacarpals, and phalanges.
- Regions: Comprised of pectoral, scapular, axillary, arm, elbow, forearm, wrist, and hand regions.
Muscles
- Involves muscle groups across the pectoral region, back, arm, forearm, and hand.
Nerve Supply
- Brachial plexus provides motor and sensory innervation to the upper limb, with specific branches for each nerve section (musculocutaneous, median, ulnar, axillary, radial).
- Spinal accessory nerve (Cranial Nerve XI) plays a role in neck and shoulder movements.
Vasculature
- Includes arteries and veins that supply and drain the upper limb, essential for understanding blood flow and potential injury impacts.
Lymphatic System
- The axillary lymph nodes and associated vessels are integral for protecting against infections and metastasis.
Joints
- Key joints include the sternoclavicular, acromioclavicular, glenohumeral (shoulder), elbow, and proximal radioulnar joints, crucial for limb mobility.
Clavicle Function
- Acts as a strut holding the arm laterally; sole connection between upper limb and axial skeleton.
- Commonly fractured due to falls; fractures occur at the junction of the middle and outer thirds.
Scapula Anatomy
- Flat, triangular bone situated on the posterior chest wall, articulating with the acromial extremity of the clavicle.
- Key features: three borders (superior, medial, lateral), three angles, and two surfaces (dorsal, costal).
- Important processes include the spine, acromion, and coracoid.
Thoracic Outlet Syndrome
- Narrowing between the clavicle and first rib can compress nerves and blood vessels, leading to thoracic outlet syndrome symptoms.
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Description
This quiz explores the anatomy of the clavicle in the context of a case study involving a 64-year-old woman who suffered a shoulder injury. It covers foundational knowledge about the clavicle's structure, its role in upper limb function, and assesses understanding of nerve implications in shoulder dislocations. Test your knowledge of upper limb anatomy and clinical assessments.
