The orientation of the clavicle can be distinguished by its ends: a broad, flat acromial end (referred to as the lateral third); and a round pyramidal-like sternal end (referred to as the medial two-thirds). Each end has unique bony landmarks, depending whether the superior or inferior surface of the bone is viewed.
How can you tell which end of the clavicle articulates with the sternum and which end articulates with the acromial end?
The clavicle is an anterior bone whose sternal end articulates with the manubrium of the sternum at the sternoclavicular joint. The sternal end is also anchored to the first rib by the costoclavicular ligament. The acromial end of the clavicle articulates with the acromion of the scapula at the acromioclavicular joint.
How can you tell the difference between the right and left clavicle?
Right clavicle extends from manubrium of the sternum to acromion of right scapula, whereas left clavicle extends from manubrium of the sternum to acromion of left scapula. Right clavicle is usually shorter and stronger than left clavicle.
Where is sternal end located?
The sternal end (sternal extremity) of the clavicle is triangular in form, directed medialward, and a little downward and forward; it presents an articular facet, concave from before backward, convex from above downward, which articulates with the manubrium sterni through the intervention of an articular disk.What is the sternal end of clavicle?
The medial end is also known as the sternal end. It is quadrangular and articulates with the clavicular notch of the manubrium of the sternum to form the sternoclavicular joint. The articular surface extends to the inferior aspect for articulation with the first costal cartilage.
What is Acromial end?
Acromial or lateral end (extremitas acromialis) is the flattened end of the clavicle that articulates with acromion of the scapula. [
Where does the Acromial end articulate?
The acromial end of the clavicle articulates with the acromion of the scapula forming the acromioclavicular joint.
Which of the following structures is located between the greater and lesser tubercles of the humerus?
The lateral surface of the greater tubercle is convex, rough, and continuous with the lateral surface of the body of the humerus. It can be described as having a cranial and a caudal part. Between the greater tubercle and the lesser tubercle is the bicipital groove (intertubercular sulcus).Is the left clavicle superior or inferior to the right scapula?
The clavicles, in general, are superior to the scapulae, although this is not the clearest set of directions.
What is sternal region?The sternum or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major blood vessels from injury.
Article first time published onWhat is sternal anatomy?
Sternum. The sternum is the bone that lies in the anterior midline of our thorax. It forms part of the rib cage and the anterior-most part of the thorax. Its functions are to protect the thoracic organs from trauma and also form the bony attachment for various muscles.
How do you know where your sternum is?
- Manubrium. This is the top part of your sternum. …
- Body. The body is the middle part of the sternum and is also the longest. …
- Xiphoid process.
Which region of the clavicle is known as the Acromial end?
The conoid tubercle is found on the lateral end (acromial extremity) of the clavicle, and is located posteriorly. It is the attachment point for the conoid ligament, which attaches to the coracoid process of the scapula and reinforces the joint between these two bones.
Which of the following is found on the anterior surface of the humerus?
The smaller lesser tubercle of the humerus is found on the anterior aspect of the humerus. Both the greater and lesser tubercles serve as attachment sites for muscles that act across the shoulder joint.
What is the acromion process of the scapula?
In human anatomy, the acromion (from Greek: akros, “highest”, ōmos, “shoulder”, plural: acromia) is a bony process on the scapula (shoulder blade). Together with the coracoid process it extends laterally over the shoulder joint. The acromion is a continuation of the scapular spine, and hooks over anteriorly.
How do you tell if a radius is left or right?
- Locate the anterior aspect of the radius bone. …
- When viewed anteriorly, the radial tubercle towards the proximal end will point the direction as per the side of the body it is from, i.e. right radius will have the radial tubercle on the right side.
What is the difference between the anatomical neck and the surgical neck of the humerus?
There is a portion called the anatomical neck and one called the surgical neck. The anatomical neck is the portion that lies just below the head. As the neck continues along the humerus body, it is called the surgical neck (so named because this is the location of many fractures that require surgery). 3.
What bone articulates with the medial end of the clavicle?
As we’ve seen, the medial end of the clavicle articulates with the sternum at the sterno-clavicular joint.
Where is the axillary border of scapula?
The axillary border of the scapula is the thickest of the three borders of the scapula bone. It extends down from the lower margin of the glenoid cavity all the way along the lateral edge of the scapula to the inferior angle.
How is the clavicle attached to the sternum?
The Sternoclavicular Joint (SC joint) is formed from the articulation of the medial aspect of the clavicle and the manubrium of the sternum. The SC joint is the only true articulation connecting the upper limb to the axial skeleton, and that it’s the least constricted joint in the human body.
Is the acromion anterior or posterior?
On the anterior side, facing into the body, is a right-angled process called the coracoid process. While at the superior lateral edge of the scapula the glenoid cavity, which serves as the socket for the head of the humerus bone. The glenoid cavity always points laterally, while the spine and acromion are posterior.
What is the difference between the acromion and the coracoid process?
The Acromion and the Coracoid Processes The acromion process is attached to the scapular spine, and it works with the coracoid process of the scapula to form a solid and stable shoulder joint. … The coracoid process hooks like a raven’s beak and forms the bridge across the shoulder joint.
What is the Acromial superior to?
Introduction. The acromion is a posterior shoulder landmark, formed as a posterolateral extension of the scapular spine, superior to the glenoid. It articulates with the clavicle and is the origin of the deltoid and trapezius muscles (1). … It is a common cause of chronic shoulder pain in adults.
What is the acromial?
Medical Definition of acromion : the outer end of the spine of the scapula that protects the glenoid cavity, forms the outer angle of the shoulder, and articulates with the clavicle. — called also acromial process, acromion process.
What muscle attaches to the acromion?
Two major muscles, the deltoid and trapezius, attach to the acromion. The deltoid, which abducts the arm at the shoulder, forms its origin along the acromion, the spine of the scapula, and the clavicle. From these origins, it crosses the shoulder joint and inserts on the deltoid tuberosity of the humerus.
What distinguishes the proximal end of the ulna from the distal end?
Proximally, the head of the radius articulates with the ulna’s radial notch. This articulation is the proximal radioulnar joint. Distally, the head of the ulna articulates with the ulnar notch of the radius.
Is the sternum medial to the vertebral column?
The breastbone is ANTERIOR to the spine. The sternum is ANTERIOR to the heart.
Where are the greater and lesser tubercles located?
The greater and lesser tubercles are part of the humerus, a bone located in the upper arm.
How do you palpate greater and lesser tubercle?
Palpation of the greater and lesser tubercles on the head of the humerus. ✨ Place your finger pads over the anterior surface of the proximal arm. ✨ Laterally and medially rotate the client’s arm at the shoulder joint and feel for the tubercles and the bicipital groove to pass under your fingers.
How do you know which side of the humerus is?
Look for the deep olecranon fossa on the lower (distal) end. Rotate the humerus so that the capitulum and trochlea face YOU. If the capitulum is on the left side of the bone, it is a left humerus. If the capitulum is on the right side, it is a right humerus.
What is the sternal angle?
The sternal angle is an important clinical landmark for identifying many other anatomical points: It marks the point at which the costal cartilages of the second rib articulate with the sternum. This is particularly useful when counting ribs to identify landmarks as rib one is often impalpable.
