Dominic Stone
The clavicle, also known as the collar bone, is a long, horizontally-lying bone that forms the front part of the shoulder. It connects the shoulder blade to the sternum or breastbone. The subclavius muscle is a small muscle that is attached to a groove in the middle of the clavicle's inferior surface. It extends into both the lateral and medial areas of the clavicle. The subclavius muscle is responsible for depressing, or drawing the clavicle downwards and forward, while also steadying the clavicle during movements of the shoulder girdle.
| Characteristics | Values |
|---|---|
| Name of muscle that depresses the clavicle | Subclavius muscle |
| Shape | Small and triangular |
| Location | Between the clavicle and the first rib |
| Nerve | Subclavian nerve |
| Origin | Junction of the fifth and sixth cervical nerves |
| Insertion | Groove on the under surface of the clavicle |
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What You'll Learn
The subclavius muscle depresses the clavicle
The clavicle, or collarbone, is a long bone that makes up the front part of the shoulder. It sits between the shoulder blade and the sternum or breastbone. There are two clavicles in a person, one on the right and one on the left side. The clavicle is a horizontally placed long bone, the only one in the human body with this orientation.
The subclavius muscle is a small, triangular muscle that is attached to a groove in the middle of the clavicle's inferior surface. It is placed between the clavicle and the first rib. The muscle fibres extend obliquely from the first rib and its cartilage at their junction, in front of the costoclavicular ligament, to the groove on the under surface of the clavicle. The subclavius muscle is one of six muscles attached to the clavicle, along with the trapezius, deltoid, sternocleidomastoid, and pectoralis major muscles.
The subclavius muscle is part of the anterior axioappendicular muscles, or the anterior wall of the axilla, along with the pectoralis major and pectoralis minor muscles. The nerve to the subclavius, or subclavian nerve, arises from the junction of the fifth and sixth cervical nerves, from the upper trunk of the brachial plexus.
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It is attached to a groove in the middle of the clavicle's inferior surface
The clavicle, or collarbone, is an S-shaped long bone that sits between the shoulder blade and the sternum. There are two clavicles in the human body, one on the left and one on the right side. The clavicle is the only long bone in the body that lies horizontally.
The subclavius muscle is a small muscle that passes from the first rib at the junction between the rib and its costal cartilage to a groove on the inferior (lower) surface of the clavicle. This groove is found in the middle of the clavicle's inferior surface. From there, the muscle extends into both the lateral and medial areas of the clavicle. The subclavius muscle is one of six muscles attached to the clavicle, with four of these muscles attached to the medial third of the clavicle.
The subclavius muscle depresses, or draws, the clavicle downwards and forward. It also steadies the clavicle during movements of the shoulder girdle. The subclavius muscle, along with the pectoralis major and pectoralis minor muscles, make up the anterior axioappendicular muscles, also known as the anterior wall of the axilla.
The clavicle plays an essential role in functional movement, serving as the connection between the axial skeleton and the pectoral girdle. This allows the clavicle to act as a brace for the shoulder, transferring weight from the upper limbs to the axial skeleton. The clavicle also plays a protective role for neurovascular structures entering the thorax, such as the brachiocephalic arterial trunk, internal jugular vein, common carotid artery, vagus and phrenic nerves, along with the sternum.
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The subclavius is a small, triangular muscle
The subclavius is part of a group of muscles known as the anterior axioappendicular muscles, or the anterior wall of the axilla. This group also includes the pectoralis major and pectoralis minor muscles. The subclavius arises from a short, thick tendon at the junction of the first rib and its cartilage, in front of the costoclavicular ligament. The fleshy fibres of the subclavius proceed obliquely superolaterally, inserting into the groove on the under surface of the clavicle.
The subclavius is innervated by the subclavian nerve, which arises from the junction of the fifth and sixth cervical nerves, branching from the upper trunk of the brachial plexus. The muscle acts to depress the clavicle, drawing the shoulder forward and downward, and stabilising the clavicle during movements of the shoulder girdle.
The subclavius is a relatively small muscle compared to other muscles in the shoulder and upper limb region. However, its unique position and function make it an important contributor to the overall stability and movement of the shoulder girdle.
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It extends into both lateral and medial areas of the clavicle
The clavicle, also known as the collar bone, is a long bone that sits horizontally across the body, connecting the shoulder blade to the sternum (breastbone). There are two clavicles, one on the left and one on the right side of the body. The clavicle is a crucial part of the shoulder girdle, acting as a brace and allowing for the transfer of weight from the upper limbs to the axial skeleton.
The subclavius muscle is a small, triangular muscle that plays a role in depressing the clavicle. It originates at the junction of the first rib and its cartilage, attaching to a groove on the inferior (lower) surface of the clavicle. From this origin point, the subclavius muscle extends into both the lateral and medial areas of the clavicle. This muscle helps to draw the clavicle downwards and forward, contributing to the dynamic stability of the shoulder.
The subclavius muscle is part of a group of muscles known as the anterior axioappendicular muscles or the anterior wall of the axilla. These muscles also include the pectoralis major and pectoralis minor. The subclavius muscle is innervated by the subclavian nerve, which arises from the junction of the fifth and sixth cervical nerves of the brachial plexus. This muscle plays a protective role for neurovascular structures entering the thorax, such as the brachiocephalic arterial trunk and internal jugular vein.
The clavicle is susceptible to fractures, which can occur due to impacts during activities like contact sports, car accidents, or falls. These fractures can also happen during childbirth. The most common site of fracture is the junction between the two curvatures of the bone, which is the weakest point. A break in the clavicle can lead to the lifting of the medial aspect by the sternocleidomastoid muscle, potentially resulting in skin perforation.
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The subclavius steadies the clavicle during shoulder movements
The clavicle, or collarbone, is a long, slender, S-shaped bone that connects the shoulder blade to the sternum or breastbone. There are two clavicles in a person, one on the right and one on the left side of the body. The clavicle is the only long bone in the body that lies horizontally.
The subclavius muscle is a small, triangular muscle that lies between the clavicle and the first rib. It arises from a short, thick tendon at the junction of the first rib and its cartilage, in front of the costoclavicular ligament. The subclavius muscle then extends into both the lateral and medial areas of the clavicle, attaching to a groove on the undersurface of the bone.
The subclavius muscle acts to depress the clavicle, drawing the shoulder forward and downward. This muscle steadies the clavicle during movements of the shoulder girdle, providing dynamic stability to the joint. The subclavius is one of six muscles attached to the clavicle, along with the trapezius, deltoid, sternocleidomastoid, pectoralis major, and sternohyoid muscles.
The clavicle plays an essential role in functional movement, serving as the connection between the axial skeleton and the pectoral girdle. This allows the clavicle to act as a brace for the shoulder, transferring weight from the upper limbs to the axial skeleton. Additionally, the clavicle helps protect neurovascular structures entering the thorax, such as the brachiocephalic arterial trunk and internal jugular vein.
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Frequently asked questions
The subclavius muscle depresses the clavicle.
The clavicle is the collar bone, a long, slender, S-shaped bone that sits between the shoulder blade and the sternum.
The subclavius muscle is a small, triangular muscle that sits between the clavicle and the first rib.
The subclavius muscle draws the clavicle downwards and forward, and steadies the clavicle during shoulder movements.
The clavicle is the most commonly fractured bone, often caused by impacts to the shoulder or a direct hit to the collarbone.
