Podcast
Questions and Answers
The human body has four limbs: what are they called?
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.
The clavicle is a bone that is directly connected to the skull.
False (B)
What is the function of the clavicle?
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?
What are the two main segments that make up the upper limb?
Which of the following is NOT part of the upper limb?
Which of the following is NOT part of the upper limb?
The ______ is the most prominent feature of the clavicle's medial end, which connects to the ______.
The ______ is the most prominent feature of the clavicle's medial end, which connects to the ______.
The clavicle is an S-shaped bone.
The clavicle is an S-shaped bone.
What are the two surfaces of the clavicle?
What are the two surfaces of the clavicle?
What is the most lateral aspect of the clavicle called?
What is the most lateral aspect of the clavicle called?
The inferior surface of the clavicle is wider than the superior surface.
The inferior surface of the clavicle is wider than the superior surface.
The anterior border of the clavicle is ______ and ______ while the posterior border is more ______.
The anterior border of the clavicle is ______ and ______ while the posterior border is more ______.
The clavicle is prone to fractures because it is a delicate bone.
The clavicle is prone to fractures because it is a delicate bone.
Explain how the medial end of the clavicle connects to the sternum.
Explain how the medial end of the clavicle connects to the sternum.
Flashcards
Clavicle Function
Clavicle Function
The clavicle, or collarbone, connects the upper limb to the axial skeleton (chest).
Clavicle Location
Clavicle Location
Extends from the sternum to the scapula (shoulder blade).
Clavicle Shape
Clavicle Shape
S-shaped.
Clavicle Surfaces
Clavicle Surfaces
Two main faces: superior and inferior.
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Superior Clavicle Surface
Superior Clavicle Surface
Mostly smooth, medial 2/3 is convex, lateral 1/3 is flat.
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Inferior Clavicle Surface
Inferior Clavicle Surface
More complex, with ligamentous impressions, a foramen and muscles attachments.
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Clavicle Borders
Clavicle Borders
Two borders: Anterior and Posterior, with muscle attachments.
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Sternal Extremity
Sternal Extremity
Thick end of the clavicle, articulates with the sternum.
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Acromial Extremity
Acromial Extremity
Flat end of the clavicle, articulates with the acromion of the scapula.
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Intramembranous Ossification
Intramembranous Ossification
The process by which the clavicle develops.
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Pectoral Girdle
Pectoral Girdle
The clavicle and the scapula form the pectoral girdle.
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Medial Clavicle Position
Medial Clavicle Position
The thicker end of the clavicle faces medially towards the body's center.
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Lateral Clavicle Position
Lateral Clavicle Position
The concave/thinner end is positioned ventrally (front of the body).
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Radiographic Anatomy
Radiographic Anatomy
A view of the clavicle on an X-ray.
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Clavicle Structure
Clavicle Structure
The clavicle is a flat bone relatively resistant to fractures.
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SternoClavicular Joint
SternoClavicular Joint
The joint between the sternum and the clavicle.
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Upper Limb
Upper Limb
The upper limb consists of the pectoral girdle and the free part of the upper limb.
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Scapula
Scapula
The shoulder blade, part of the pectoral girdle.
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Steroclavicular Ligament
Steroclavicular Ligament
One of the ligaments on the clavicle.
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Muscular Attachments (Clavicle)
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
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
Medullary Canal
The marrow cavity inside long bones
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Radiograph
Radiograph
An X-ray image
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Ribs
Ribs
Ribs create the upper chest.
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Cortex
Cortex
Outer layer of the bone
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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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