Clavicle Flashcards
How many bones are there in the upper limb.
64
Each side of the upper limb consists of how many bones!!
32
Meaning of clavicle in latin ?
A small key
Role of clavicle
To transmit the wt of the limb to the sternum .
Clavicle consists of
A shaft and 2 ends (lateral and medial)
Lateral is 1/3rd part and
Medial is 2/3rs part.
Lateral end and medial end of the clavicle are called
Acromion and sternal end respectively.
The lateral end of the clavicle is flat or quadrilateral?
Flat
The medial end of the clavicle is flat or quadrilateral ?
Quadrilateral
Where the shaft is concave and convex according to the lateral and medial position ?
Lateral is concave
Medial is convex
Which surface of the clavicle is grooved and in which direction lateral 1/3rd , middle 2/3rd or middle 1/3rd . Also the name of the groove with muscle ?
The inferior surface
the middle 1/3rd and lateral half
Subclavian groove
Subclavius muscle .
Is clavicle the only horizontal bone in the human body ?
True
Which bone is the first to ossify ?
Clavicle
Which is the only bone that ossifies in membrane
Clavicle
It forms from intra-membranous ossification .
How many primary and secondary centers are there in clavicle
2 primary centers (only in clavicle)
1 second
Is the medullary cavity present in the clavicle
No
(Medullary cavity has bone marrow and is hollow in structure also bone marrow makes blood cells and stores fat )
Which nerve is occasionally pierced through clavicle
middle Supraclavicular nerve .
Clavicle receives the wt of the upper limb via which ligament
Coracoclavicular ligament
Lateral 1/3rd of the shaft is of which shape both anteriorly and posteriorly
Anteriorly its concave
Posteriorly its convex
Medial 2/3rd part of the shaft is of which shape both anteriorly, posteriorly, superiorly and inferiorly.
Anteriorly its convex
Posteriorly it’s smooth.
Superior its rough
Inferior has a rough oval impression
Medial 2/3rd part of clavicle has how many surfaces
4
anterior , posterior , superior, inferior
Where the nutrient foramen lies in the clavicle ?
At the lateral end of the subclavian groove .
Lateral end and sternal end articulates at ?
Acromion process of scapula
and clavicular notch of manubrium sterni to form a sternoclavicular joint respectively.
The articular surface of the sternal end extends to the inferior aspect for articulation with what ?
First coastal cartilage
Acromioclavicular joint gives attachment to which capsule ?
Joint capsule
At the medial end of the clavicle , the articular surface gives attachment to?
a) fibrous joint all arround
b) Articular disc posteriorly
c) Interclavicular ligament superiorly
In lateral 1/3rd of shaft of the clavicle the anterior border gives origin to which muscle?
Deltoid muscle
In lateral 1/3rd shaft of the clavicle the posterior border provides insertion to which muscle?
Trapezius muscle
The conoid tubericle and trapezoid ridge gives attachment to which ligament?
Conoid and trapezoid parts of coracoclavicular ligament
In Medial 2/3rd of the shaft of the clavicle the anterior surface gives origin to which muscle
Pectoralis major
In medial 2/3rd of the shaft of the clavicle how much portion of the rough superior surface gives origin to which muscle
Half of rough superior surface gives origin to the clavicular head of the sternocleidomastoid muscle.
The oval impression on the inferior surface at the medial end of clavicle gives attachment to which ligament?
Costoclavicular ligament or rhomboid ligament
In medial 2/3rd of the shaft of the clavicle, the subclavian groove gives insertion to which muscle?
and the margins of the groove gives attachment to?
1)Subclavius muscle
2)Clavipectoral fascia
In medial 2/3rd of the shaft of the clavicle , the posterior surface close to the medial end gives origin to which muscle
Sternohyoid muscle
The subclavian vessels and divisions of trunks of what, pass towards the axilla lying between the inferior surface of the clavicle and upper surface of the first rib ?
Brachial plexus
Which muscle acts as a cushion between clavicle and first rib ?
Subclavius muscle
The nutrient foramen of clavicle transmits a branch of which artery ?
Suprascapular artery
Which end of clavicle ossifies from membrane?
Medial end
The 2 primary centers of the clavicle appear in which part of the clavicle, also in what week it appears and fused ?
In the shaft ,
appears in 5th and 6th weeks of intrauterine life ,
and fuses with the shaft at the 45th day
The secondary center for the medial end appears during which year and in which year it fuses ?
15-17 years it appears
21-22 years it fuses with the shaft
Can the acromial end have a secondary center ?
Occasionally,it may be present
The most common site of fracture in clavicle is
The junction b/w the two curvatures of the bone , which is the weakest
The clavicle may be congenitally absent , or imperfectly developed in a disease called
Cleidocranial dysostosis. In this condition the shoulders droop and can be approximated anteriorly in front of the chest.
