The deltoid tuberosity of the humerus lies proximally about a third of the way to the elbow and provides an attachment point for the deltoid muscle. The deltoid is a triangular muscle with three attachment points: the humerus, the clavicle, and the scapula.

What muscles attach to deltoid tuberosity?

The capitulum has a thinner epicondylar attachment to the bone and is the main weight-bearing surface for the radial head. Important muscles to identify laterally are the lateral head of the triceps, the brachialis, the brachiocephalicus, and the acromial head of the deltoid.

What muscle attaches to the radial tuberosity?

Biceps brachii attaches to the radial tuberosity.

What is attached to deltoid?

The deltoid is attached by tendons to the skeleton at the clavicle (collarbone), scapula (shoulder blade), and humerus (upper arm bone). The deltoid is widest at the top of the shoulder and narrows to its apex as it travels down the arm.

Where does the deltoid muscle attach?

The base of the deltoids connects to the upper part of your scapula (shoulder blade) and the side of your clavicle (collarbone). The point of the deltoids attaches to the side of your humerus (the arm bone between your shoulder and elbow).

Is the deltoid a flexor or extensor?

The deltoid muscle has multiple functions: it’s almost like three different muscles. Its anterior part is a powerful flexor, its posterior part is a powerful extensor, and its lateral part is a powerful abductor.

What is the distal attachment of the deltoid?

The deltoid muscle was delineated from its origin to its insertion, with care not to disturb the fascial interconnections of the muscle distally (Figure 2). The insertion was left attached to the lateral humerus. The deltoid was then detached from its origin on the clavicle, acromion, and scapular spine.

What is a tuberosity?

Tuberosity – A moderate prominence where muscles and connective tissues attach. Its function is similar to that of a trochanter. Examples include the tibial tuberosity, deltoid tuberosity, and ischial tuberosity. Tubercle – A small, rounded prominence where connective tissues attach.

What muscle is below the deltoid muscle?

The axillary nerve runs under the deltoid muscle and travels posterior to anterior. It is at risk if the anterior deltoid is vigorously retracted laterally or if retractor placement is under the deltoid.

Which muscle inserts on the tibial tuberosity?

The quadriceps femoris is a four-headed muscle that inserts onto the tibial tuberosity. It extends the knee, and one head (rectus femoris) flexes the hip. The patella is a sesamoid bone that lies within the quadriceps tendon.

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What is radial tuberosity?

Medical Definition of radial tuberosity : an oval eminence on the medial side of the radius distal to the neck where the tendon of the biceps brachii muscle inserts.

How do you find the deltoid tuberosity?

In human anatomy, the deltoid tuberosity is a rough, triangular area on the anterolateral (front-side) surface of the middle of the humerus.

Where are pectorals located?

pectoralis muscle, any of the muscles that connect the front walls of the chest with the bones of the upper arm and shoulder. There are two such muscles on each side of the sternum (breastbone) in the human body: pectoralis major and pectoralis minor.

Does the biceps brachii muscle attach to the humerus?

The long head attaches to the supraglenoid tubercle of the scapula, which is just above the space where the humerus, or upper arm, enters the shoulder. … The biceps brachii crosses the inside of the elbow and attaches at the radial tuberosity, which is a feature on the radius – one of the two bones in- the lower arm.

What is the proximal attachment of the deltoid?

The deltoid muscle originates from the lateral part of the clavicle (collarbone), as well as the spine and acromion process of the scapula (shoulder blade). From these points of origin, the muscle then travels down the arm and inserts on the deltoid tuberosity of the humerus (long bone of the upper arm).

Where does the deltoid attach to the humerus?

It inserts into the deltoid tuberosity located approximately halfway down the lateral aspect of the shaft of the humerus.

What is the proximal attachment of the supraspinatus quizlet?

This muscle has proximal attachment at posterior scapula (supraspinatus fossa) and distal attachment at greater tubercle. … This muscle has proximal attachment at the anterior surface of scapula and distal attachment at the lesser tubercle.

Where does Brachioradialis attach?

OriginLateral supracondylar ridge of humerus, lateral intermuscular septum of armInsertion(Proximal to) styloid process of radiusActionElbow joint: Forearm flexion (when semi pronated)InnervationRadial nerve (C5-C6)Blood supplyRadial artery, radial recurrent arteries, radial collateral artery

Is deltoid anterior or posterior?

Anterior part of deltoid (arises from most of the anterior border and upper surface of the lateral third of the clavicle.) Intermediate part of deltoid (arises from the superior surface of the acromion process.) Posterior part of deltoid (arises from the lower lip of the posterior border of the spine of the scapula.)

Is the trapezius anterior or posterior?

The trapezius is a broad, flat, superficial muscle extending from the cervical to thoracic region on the posterior aspect of the neck and trunk.

What is the Coracobrachialis?

Coracobrachialis muscle is one of the three muscles that originates from to the coracoid process of the scapula. It is situated at the superomedial part of the humerus.

What is supraspinatus muscle?

Description. Supraspinatus is the smallest of the 4 muscles which comprise the Rotator Cuff of the shoulder joint specifically in the supraspinatus fossa. It travels underneath the acromion.

Where is the greater tubercle?

The greater tuberosity is the prominent area of bone at the top of the humerus and is the attachment for the two large, powerful rotator cuff muscles – supraspinatus and infraspinatus. It is injured/fractured in a fall by either landing directly onto the side of your shoulder or landing with your arm outstretched.

Is tuberosity a bone projection?

Bone Markings (Table 7.2)MarkingDescriptionExampleTuberosityRough surfaceDeltoid tuberosityLineSlight, elongated ridgeTemporal lines of the parietal bonesCrestRidgeIliac crest

Is tuberosity the same as tubercle?

Tubercle vs tuberosity A tubercle is a small rounded prominence, often a site of tendon or ligament attachment e.g. adductor tubercle of the femur. A tuberosity is larger, found in varying shapes and often rough in texture. The ulnar tuberosity is one example.

Where is the ulnar tuberosity?

The tuberosity of the ulna is a rough eminence on the proximal end of the ulna. It occurs at the junction of the antero-inferior surface of the coronoid process with the front of the body.

Do the hamstrings insert on the tibial tuberosity?

Conclusion. The flexor tendons are inserted on average 40 mm distally to the tibial plateau and 7 mm medially to the anterior tibial tuberosity. The insertion of the knee flexor tendons is oblique and is at an angle of 20° in relation to the tibial plateau.

Which structure attaches the patella to the tibial tuberosity?

The patellar ligament envelopes the inferior third of the patella and attaches the bone to the tibial tuberosity.

Which connects the kneecap to the tibial tuberosity quizlet?

The patellar ligament is the distal portion of the common tendon of the quadriceps femoris, which is continued from the patella to the tibial tuberosity. It is also sometimes called the patellar tendon as it is a continuation of the quadriceps tendon.

What originates from the radial tuberosity?

Radial tuberosity – Tuberositas radii The radial tuberosity is a roughly area of the dorsomedial part of the neck of the radius, for insertion of the biceps brachii muscle.

What attaches to the olecranon process?

Olecranon: The bony tip of the elbow. The olecranon is the near end of the ulna, the bone in the forearm, and it forms the pointed portion of the elbow. The triceps muscle tendon of the back of the arm attaches to the olecranon.