Clavicle Anatomy Quiz

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Questions and Answers

The human body has four limbs: what are they called?

  • Two lower limbs and two upper limbs
  • Two forelimbs and two hindlimbs
  • Two upper limbs and two lower limbs (correct)
  • Two arms and two legs

The clavicle is a bone that is directly connected to the skull.

False (B)

What is the function of the clavicle?

  • To protect the heart
  • To allow for movement of the elbow
  • To connect the shoulder blade to the sternum (correct)
  • To support the weight of the head

What are the two main segments that make up the upper limb?

<p>The shoulder and the arm</p> Signup and view all the answers

Which of the following is NOT part of the upper limb?

<p>Femur (A)</p> Signup and view all the answers

The ______ is the most prominent feature of the clavicle's medial end, which connects to the ______.

<p>The medial end of the clavicle is characterized by the presence of a <strong>sternal articulation</strong>, which is the point where the clavicle connects to the <strong>sternum</strong> (breastbone).</p> Signup and view all the answers

The clavicle is an S-shaped bone.

<p>True (A)</p> Signup and view all the answers

What are the two surfaces of the clavicle?

<p>The superior surface and the inferior surface</p> Signup and view all the answers

What is the most lateral aspect of the clavicle called?

<p>Acromial end (D)</p> Signup and view all the answers

The inferior surface of the clavicle is wider than the superior surface.

<p>True (A)</p> Signup and view all the answers

The anterior border of the clavicle is ______ and ______ while the posterior border is more ______.

<p>The anterior border of the clavicle is smooth and rounded, while the posterior border is more prominent.</p> Signup and view all the answers

The clavicle is prone to fractures because it is a delicate bone.

<p>False (B)</p> Signup and view all the answers

Explain how the medial end of the clavicle connects to the sternum.

<p>The medial end of the clavicle articulates with the sternum through a joint called the sternoclavicular joint. The joint is reinforced by strong ligaments to provide stability and allow limited movement.</p> Signup and view all the answers

Flashcards

Clavicle Function

The clavicle, or collarbone, connects the upper limb to the axial skeleton (chest).

Clavicle Location

Extends from the sternum to the scapula (shoulder blade).

Clavicle Shape

S-shaped.

Clavicle Surfaces

Two main faces: superior and inferior.

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Superior Clavicle Surface

Mostly smooth, medial 2/3 is convex, lateral 1/3 is flat.

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Inferior Clavicle Surface

More complex, with ligamentous impressions, a foramen and muscles attachments.

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Clavicle Borders

Two borders: Anterior and Posterior, with muscle attachments.

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Sternal Extremity

Thick end of the clavicle, articulates with the sternum.

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Acromial Extremity

Flat end of the clavicle, articulates with the acromion of the scapula.

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Intramembranous Ossification

The process by which the clavicle develops.

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Pectoral Girdle

The clavicle and the scapula form the pectoral girdle.

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Medial Clavicle Position

The thicker end of the clavicle faces medially towards the body's center.

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Lateral Clavicle Position

The concave/thinner end is positioned ventrally (front of the body).

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Radiographic Anatomy

A view of the clavicle on an X-ray.

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Clavicle Structure

The clavicle is a flat bone relatively resistant to fractures.

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SternoClavicular Joint

The joint between the sternum and the clavicle.

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Upper Limb

The upper limb consists of the pectoral girdle and the free part of the upper limb.

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Scapula

The shoulder blade, part of the pectoral girdle.

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Steroclavicular Ligament

One of the ligaments on the clavicle.

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Muscular Attachments (Clavicle)

Clavicle serves as an attachment point for muscles of the chest, neck and shoulder.

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Free Portion of Upper Limb

The portion of the upper limb that includes the humerus, radius, ulna, carpals and hand bones

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Medullary Canal

The marrow cavity inside long bones

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Radiograph

An X-ray image

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Ribs

Ribs create the upper chest.

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Cortex

Outer layer of the bone

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Study Notes

Clavicle Anatomy

  • The clavicle is a long bone, extending from the sternum to the scapula.
  • It is positioned medially at its thickest end, inferiorly with a slightly concave face, and its convex border is medial to its end.
  • Its shape is described as an italic "S", with two faces, two edges, and two ends.

Clavicle Surface Features

  • Superior Surface: Mostly subcutaneous (beneath the skin), flat, and somewhat convex in its middle two-thirds. It has slight grooves for muscle attachments, most notably the sternocleidomastoid and pectoral muscles.
  • Inferior Surface: More complex than the superior surface, with several noticeable features including an impression of the costoclavicular ligament; a groove for the subclavius muscle; a tubercle for the coracoclavicular ligament; and a nutrient foramen.
  • Anterior Border: Curved and smooth in the medial two-thirds, and rougher and more irregular in the lateral third, providing attachment points for muscles like the pectoralis major.
  • Posterior Border: More prominent than the anterior, curving smooth; with attachments for the trapezius and sternocleidomastoid muscles.
  • Sternal End: Bulky, articulating with the sternum, presenting a smooth articular surface with two planes.
  • Acromial End: Flattened, articulating with the acromion of the scapula.

Clavicle Structure

  • The clavicle is a flat bone.
  • Its cortex (outer layer) is thick.
  • The ends of the clavicle consist largely of spongy bone.
  • It is solid and strong, with frequent fracture sites due to its superficial position, but rapid healing occurs

Radiographic Anatomy

  • An anteroposterior (AP) radiograph of the clavicle helps visualize the upper chest.
  • The medial portion lies above the ribs.
  • The inferior border is visible in the supraclavicular fossa.

Development

  • The clavicle's ossification begins around the fourth week of life.

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