Maximus Gage
The clavicle, or collarbone, is a long, thin, S-shaped bone that connects the trunk to the arm. It is the only long bone in the body that lies horizontally. The collarbone is prone to injury and is the most commonly fractured bone in the human body. This is due to its location and role in shoulder movement, as well as its thin structure. The collarbone has multiple attachment sites for muscles, including the trapezius, deltoid, pectoralis major, and sternocleidomastoid muscles. These muscles play a role in shoulder and arm movement, as well as providing stability to the scapula.
| Characteristics | Values |
|---|---|
| Muscles attached | Sternocleidomastoid, Trapezius, Pectoralis Major, Deltoid, Sternohyoid, Subclavius |
| Clavicle (Collarbone) | Long, thin, S-shaped bone |
| Length | Approximately 6 inches (15 cm) |
| Function | Connects the trunk/body to the arm |
| Location | Runs from the sternum to the shoulder blade |
| Fracture | Common injury, especially in young active individuals |
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What You'll Learn
- The trapezius muscle attaches to the posterior surface of the collarbone
- The deltoid muscle attaches to the anterior surface of the collarbone
- The pectoralis major muscle attaches to the anterior surface of the collarbone
- The sternocleidomastoid muscle attaches to the superior surface of the collarbone
- The subclavius muscle attaches to the subclavian groove of the collarbone
The trapezius muscle attaches to the posterior surface of the collarbone
The collarbone, or clavicle, is a long, thin, S-shaped bone that connects the trunk to the arm. It is approximately 6 inches (15 cm) long and runs from the sternum to the shoulder blade. The collarbone is prone to injuries such as fractures, dislocated shoulders, and separated shoulders, often caused by falls or contact sports.
The trapezius muscle is a large, paired, trapezoid-shaped muscle that extends from the occipital bone to the lower thoracic vertebrae of the spine and laterally to the spine of the scapula. It moves the scapula and supports the arm. The trapezius muscle has several origin points along the midline of the posterior neck and back.
The trapezius muscle is involved in movements of the shoulder girdle and is, therefore, considered a muscle of the upper limb rather than the back. It plays a crucial role in protracting and stabilising the scapula against the rib cage. The trapezius muscle also assists in abduction of the shoulder by rotating the glenoid upward.
The trapezius muscle can be developed through exercises such as the clean, particularly the hang clean, and the shoulder shrug. The uppermost area can be trained through neck extension, while the middle fibres are developed by pulling the shoulder blades together.
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The deltoid muscle attaches to the anterior surface of the collarbone
The collarbone, or clavicle, is a long, thin, S-shaped bone that connects the trunk to the arm. It is approximately 6 inches (15 cm) long and runs from the sternum (breastbone) to the shoulder blade. The collarbone is prone to injuries, such as fractures, dislocations, and separations, due to its location and role in shoulder movement.
The deltoid muscle is the muscle that forms the rounded contour of the human shoulder. It is a superficial muscle, meaning it is close to the surface of the skin, and has a triangular shape. The deltoid muscle is made up of three distinct sets of muscle fibers: the anterior or clavicular part (commonly known as the front delt), the posterior or scapular part (commonly known as the rear delt), and the intermediate or acromial part (commonly known as the side delt).
The anterior deltoids help move the arm forward and connect to the clavicle. They originate from the superior surface and the anterior border of the lateral third of the clavicle. The clavicular (anterior) fibers of the deltoid assist the pectoralis major in flexing the shoulder and internally rotating the humerus. They also act as a flexor and internal rotator of the arm.
The deltoid muscle works alongside other shoulder muscles, such as the rotator cuff muscles, to help perform a variety of movements. These include arm abduction, flexion, and extension. The deltoid also helps stabilize the shoulder joint to prevent dislocations when lifting the arm or carrying weight.
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The pectoralis major muscle attaches to the anterior surface of the collarbone
The clavicle, or collarbone, is a long, thin, S-shaped bone that connects the trunk to the arm. It is the only long bone in the body that lies horizontally. The collarbone is prone to injuries such as fractures, dislocated shoulders, and separated shoulders. It is also the most commonly fractured bone in the body.
The pectoralis major is the superior-most and largest muscle of the anterior chest wall. It is a thick, fan-shaped muscle that lies underneath the breast tissue. It is the most superficial muscle in the pectoral region. The pectoralis major has two heads: the clavicular and the sternocostal. The clavicular head originates from the anterior surface of the medial half of the clavicle, while the sternocostal head originates from the anterior surface of the manubrium and body of the sternum, the anterior surface of the superior six costal cartilages, and the aponeurosis of the external oblique muscle.
The pectoralis major receives dual motor innervation by the medial pectoral nerve and the lateral pectoral nerve, also known as the lateral anterior thoracic nerve. The sternal head receives innervation from the C7, C8, and T1 nerve roots, while the clavicular head receives innervation from the C5 and C6 nerve roots. The pectoralis major is active during deep or forced inspiration, assisting in breathing along with the diaphragm and intercostal muscles.
Poland syndrome is a rare congenital condition where the pectoralis major muscle is completely missing, usually on one side of the body. This condition can be accompanied by the absence of the breast in females. In rare cases, the pectoralis major muscle may develop intramuscular lipomas, which are benign tumors that may require surgical excision to prevent the risk of liposarcoma.
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The sternocleidomastoid muscle attaches to the superior surface of the collarbone
The sternocleidomastoid muscle is a powerful neck muscle that allows you to bend your neck and turn or tilt your head. It is a two-headed neck muscle with attachments to the manubrium of the sternum, the clavicle, and the mastoid process of the temporal bone. The clavicular head of the sternocleidomastoid muscle begins in the centre of the left and right collarbones and travels up both sides of the neck, merging with the sternal head. The sternal head originates from the manubrium of the sternum, while the clavicular head originates from the medial third of the clavicle. The two heads join into one muscle belly, which inserts on the lateral surface of the mastoid process of the temporal bone and the lateral half of the superior nuchal line of the occipital bone.
The sternocleidomastoid muscle is the largest muscle in the front of the neck and is located just below the skin. It is a paired muscle with two parts, starting at the bottom of the neck, wrapping around both sides, and ending at the base of the skull. The muscle is easily visible and palpable, and the carotid pulse may be felt in the middle third of its front edge. The sternocleidomastoid plays a central role in the formation of the triangles of the neck, dividing the neck into anterior and posterior triangles.
The collarbone, or clavicle, is a slender, S-shaped long bone that serves as a strut between the shoulder blade and the sternum. It is approximately 6 inches long and runs horizontally from side to side at the top of the chest. The collarbone is prone to injuries such as fractures, dislocations, and separations, especially in contact sports, falls, and trauma like car accidents. The most common type of fracture occurs when a person falls horizontally on the shoulder or with an outstretched hand, causing a break from the lateral side towards the medial side of the bone.
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The subclavius muscle attaches to the subclavian groove of the collarbone
The clavicle, or collarbone, is an S-shaped long bone that serves as a strut between the shoulder blade and the sternum (breastbone). It is the only long bone in the body that lies horizontally, connecting the arm to the trunk of the body. The collarbone is prone to injuries like fractures, dislocated shoulders, and separated shoulders. It is also one of the most commonly fractured bones.
The subclavius muscle is a small, triangular muscle in the anterior thorax located between the clavicle and the first rib. It originates from the upper border of the first rib and its cartilage, with its tendon spreading superolaterally into a muscle belly. The subclavius muscle inserts into the groove on the undersurface of the middle third of the clavicle, also known as the subclavian groove. This groove is located on the inferior surface of the collarbone, which is the flattened lateral region (acromial region) of the shaft.
The subclavius muscle is innervated by the subclavian nerve (C5-6), a branch of the brachial plexus. This nerve arises from the junction of the fifth and sixth cervical nerves. The subclavius is enclosed by the clavipectoral fascia, a fibrous connective tissue that spans the interval between the clavicle and the pectoralis minor muscle.
The subclavius muscle plays a role in depressing the lateral clavicle and stabilizing the sternoclavicular joint. It also helps to regulate the output of kinetic energy during the movement of the upper extremity. Additionally, the subclavius protects the underlying brachial plexus and subclavian vessels in the event of a fractured clavicle, preventing injury to these structures.
In summary, the subclavius muscle attaches to the subclavian groove of the collarbone, contributing to the stability and movement of the clavicle while also protecting the adjacent blood vessels and nerves from potential injury.
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Frequently asked questions
The collarbone, or clavicle, is a long, thin, S-shaped bone that connects your arm to your body.
The collarbone is located at the base of your neck and connects your shoulder blade to your sternum or breastbone.
Six muscles attach to the collarbone, with two attaching to the lateral third of the bone and four attaching to the medial third. The trapezius and deltoid muscles attach to the lateral third, while the sternocleidomastoid, pectoralis major, subclavius, and sternohyoid muscles attach to the medial third.
The collarbone plays an important role in shoulder and arm movement, allowing for optimal function of the upper extremity. It also helps keep the shoulder blade in the correct position during movement.
Due to its location and role in shoulder movement, the collarbone is prone to injuries such as fractures, dislocated shoulders, and separated shoulders. Fractures commonly occur due to falls, contact sports, or trauma like car accidents.
