Clavicle Bone Anatomy Animation : Bony landmarks and Development
Summary
TLDRThe clavicle, or collarbone, is a unique horizontal long bone located at the neck's root, forming part of the shoulder girdle. It's the first bone to ossify and has no medullary cavity. The clavicle's functions include keeping the arm away from the trunk for free movement and transmitting weight from the upper limb to the trunk. It features the sternal and acromial ends, with the latter articulating with the scapula. The bone develops from three centers of ossification, fusing by the mid-twenties.
Takeaways
- 🦴 The clavicle, also known as the collar bone, is a long bone that lies horizontally in front of the neck.
- 🔒 It plays a crucial role in the formation of the shoulder girdle and is the only long bone in the body that is subcutaneous.
- 🌀 The clavicle's unique feature is the absence of a medullary cavity.
- 🚫 It prevents the arm from swinging into the trunk, allowing free movement without contact.
- 🏋️♂️ It helps transmit weight from the upper limb to the trunk and assists in arm movement above shoulder level.
- 📏 The clavicle is divided into the shaft, acromial end, and sternal end, with the shaft further divided into lateral and medial thirds.
- 🔍 The lateral third has two surfaces and two borders, with the superior surface being subcutaneous and the inferior surface rough.
- 🔗 The medial two-thirds have four surfaces, including a rough and convex anterior surface and a smooth and concave posterior surface.
- 🔑 The acromial end is flat with an oval facet that articulates with the acromium process of the scapula.
- 📐 The sternal end is quadrangular, articulating with the clavicular notch of the manubrium sterni.
- 📈 The clavicle ossifies from three centers: two primary centers in the shaft and one secondary center, with fusion complete by the 25th year.
Q & A
What is the clavicle also known as?
-The clavicle is also known as the collar bone.
What is the primary function of the clavicle?
-The clavicle's primary function is to keep the arm away from the trunk, allowing it to swing freely without coming into contact with the trunk, and to transmit weight from the upper limb to the trunk.
How is the clavicle positioned in the body?
-The clavicle lies horizontally in front of the root of the neck and is part of the shoulder girdle.
What makes the clavicle unique among long bones?
-The clavicle is unique because it has no medullary cavity and is the only long bone in the body that lies horizontally.
What are the three main parts of the clavicle?
-The clavicle consists of the shaft, the acromial end, and the sternal end.
How is the lateral 1/3 of the clavicle's shaft described?
-The lateral 1/3 of the clavicle's shaft presents with two surfaces and two borders, with a subcutaneous superior surface, a rough inferior surface with the conoid tubercle, and a concave anterior border bearing the deltoid tubercle.
What is the significance of the trapezoid line on the clavicle?
-The trapezoid line is an oblique ridge on the clavicle that runs forwards and laterally towards the acromial end, giving attachment to the trapezoid part of the coracoclavicular ligament.
What does the medial 2/3 of the clavicle's shaft present?
-The medial 2/3 of the clavicle's shaft presents with four surfaces, including a rough and convex anterior surface, a smooth and concave posterior surface, and an inferior surface with the costal impression.
How does the acromial end of the clavicle articulate with the scapula?
-The acromial end of the clavicle is flat and has an oval facet that articulates with the clavicular facet on the acromion process of the scapula.
What is the shape of the sternal end of the clavicle?
-The sternal end of the clavicle is quadrangular and articulates with the clavicular notch of the manubrium sterni.
How can you determine the side of the clavicle?
-The flattened acromial end is on the lateral side, the rounded sternal end is on the medial side, and the shaft is convex forwards in the medial 2/3 and concave forwards in the lateral 1/3.
How does the clavicle grow and develop during intrauterine life?
-The clavicle starts to ossify from three centers: two primary centers in the medial and lateral regions of the shaft that begin to ossify by the fifth to sixth week of intrauterine life and fuse by the 45th day, and one secondary center that starts to ossify by 18 to 20 weeks of intrauterine life and fuses by the 25th year.
Outlines
🦴 Anatomy of the Clavicle
The clavicle, also known as the collar bone, is a unique long bone situated at the front of the neck's base, forming part of the shoulder girdle. It is horizontally positioned and is the only long bone in the body without a medullary cavity. The clavicle's function is to keep the arm away from the trunk, allowing free movement without contact. It also transmits weight from the upper limb to the trunk and aids in arm movement above shoulder level. The bone is divided into the shaft, acromial end, and sternal end. The shaft is further divided into lateral and medial thirds, each with distinct features such as the conoid tubercle, trapezoid line, deltoid tubercle, and coastal impression. The acromial end is flat with an oval facet for articulation with the acromium process of the scapula, while the sternal end is quadrangular, articulating with the manubrium sterni. The clavicle develops from three centers of ossification: two primary centers in the shaft and one secondary center, with the process starting in utero and completing by the mid-twenties.
Mindmap
Keywords
💡Clavicle
💡Shoulder Girdle
💡Subcutaneous
💡Medullary Cavity
💡Shaft
💡Acromial End
💡Sternal End
💡Conoid Tubercle
💡Trapezoid Line
💡Ossification
💡Intra Utrine Life
Highlights
Clavicle is also known as the collar bone and is a long bone.
It lies in front of the root of the neck and forms part of the shoulder girdle.
The clavicle is a subcutaneous bone and is the only long bone in the body that lies horizontally.
It has no medullary cavity, which is a unique characteristic.
The clavicle helps keep the arm away from the trunk, allowing it to swing freely.
It transmits weight from the upper limb to the trunk and assists in arm movement.
The clavicle consists of the shaft, acromial end, and sternal end.
The shaft is divided into lateral 1/3 and medial 2/3.
The lateral 1/3 has two surfaces and two borders with specific tubercles and lines.
The medial 2/3 presents with four surfaces including the coastal impression and subclavian groove.
The acromial end is flat and has an oval facet for articulation with the scapula.
The sternal end is quadrangular and articulates with the manubrium sterni.
The clavicle's flattened acromial end is on the lateral side, and the rounded sternal end is on the medial side.
The shaft is convex forwards in the medial 2/3 and concave forwards in the lateral 1/3.
The middle 1/3 of the inferior surface is grooved, which is significant.
Clavicle is the first bone to start the process of ossification.
Ossification begins from three centers: two primary in the shaft and one secondary.
The secondary center of ossification starts during the 18th to 20th weeks of intrauterine life and fuses by the 25th year.
Transcripts
[Music]
clavicle the clavicle is also known as
the collar bone and is a long bone it
lies in front of the root of the neck
and takes part in formation of the
shoulder girdle it is a subcutaneous
bone and is the only long bone in the
body that lies
horizontally the peculiarity of this
bone is that it has no medular cavity it
is the first bone to start
oifcfg of the shoulder keeps the arm
away from the trunk which allows it to
swing freely without coming in contact
with the trunk transmits weight from the
Upper Limb to the trunk and assists in
movement of the arm above the level of
the
shoulder the clavicle consists of the
shaft a chromal end and the sternal end
the shaft is divided into the lateral
1/3 and medial 2/3 the lateral 1/3
presents with two surfaces and two
borders the superior ior surface is
subcutaneous and the inferior surface is
rough and has the conoid tubercle which
lies close to the posterior border and
gives attachment to the conoid part of
the coracoclavicular
ligament the trapezoid line which is an
oblique Ridge which runs forwards and
laterally towards the acromial end and
gives attachment to the trapezoid part
of the coracoclavicular
ligament now coming to the anterior
border it is concave and bears the
deltoid tubercle the posterior border is
convex the medial 2/3 presents with four
surfaces the anterior surface is rough
and convex the upper surface the
posterior surface is smooth and concave
and the inferior surface presents with
the coastal impression that gives
attachment to the coastal clavicular
ligament and the sub
Groove clavipectoral fascia is attached
to the margins of the subclavian Groove
the nutrient foramin is directed
laterally and is present on the lateral
part of the subclavian
Groove a chromal end this end is flat
and has an oval facet which articulates
with the clavicular facet on the
acromium process of the scapula the
margins of which gives attachment to the
capsular ligament of the
acromioclavicular
joint the sternal end is quadrangular
and it articulates with the clavicular
notch of the manubrium
sternai the upper part gives attachment
to the interclavicular ligament capsular
ligament of the sternoclavicular joint
and articular dis of the
sternoclavicular
joint determination of the side the
flattened a chromal end is on the
lateral side the rounded sternal end is
on the medial side the shaft is convex
forwards in the medial 2/3 and concave
forwards in the lateral
1/3 the middle 1/3 of the inferior
surface is grooved
oifc it is the first bone to start the
process of oifc and it oif from three
centers two primary centers which are
located in the medial and lateral
regions of the shaft start OIC by the
fifth to 6th week of intra utrine life
and fuses by the 45th day one secondary
Center that starts oifc by 18 to 20
weeks of intra utrine life and fuses by
the 25th year
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