Anatomy of the Humerus bone: At its proximal end, the humerus is attached to the axial skeletal by the shoulder girdle or pectoral girdle, which consists of the scapula and clavicle bones. The upper or proximal extremity of the humerus consists of the bone's large rounded head joined to the body by a constricted portion called the neck, and two eminences, the greater and lesser tubercles. At birth, the neonatal humerus is only ossified in the shaft. These ossification centers begin to fuse at 3 years of age. Compact bone forms the largest and strongest structure in the humerus, surrounding the trabeculae in the ends and the medullary cavity in the shaft. Swipe for labels. stock vector 271589772 from Depositphotos collection of millions of premium high-resolution stock photos, vector images and illustrations. 1. 9. The red bone marrow inside larger bones, such as the scapulae, is the site of production of red blood cells. Today's Rank--0. The axillary nerve is located at the proximal end, against the shoulder girdle. Start Quiz Retake Quiz. The medial portion of the articular surface is named the trochlea, and presents a deep depression between two well-marked borders; it is convex from before backward, concave from side to side, and occupies the anterior, lower, and posterior parts of the extremity. More distally, at the elbow, the capitulum of the humerus articulates with the head of the radius, and the trochlea of the humerus articulates with the trochlear notch of the ulna. Add to … Nearly the whole of this surface is covered by the lateral and medial heads of the Triceps brachii, the former arising above, the latter below the radial sulcus. Its upper surface is rounded and marked by three flat impressions: the highest of these gives insertion to the supraspinatus muscle; the middle to the infraspinatus muscle; the lowest one, and the body of the bone for about 2.5 cm. The most proximal portion of the humerus is the head of the humerus, which … Anterior view. Deep dissection. In contrast, the subscapularis muscle inserts onto the lesser tubercle and works to medially, or internally, rotate the humerus. The radial nerve follows the humerus closely. Advertisement. Primitive fossils of amphibians had little, if any, shaft connecting the upper and lower extremities, making their limbs very short. It is sometimes popularly referred to as 'the funny bone', possibly due to this sensation (a "funny" feeling), as well as the fact that the bone's name is a homophone of 'humorous'. The fingers and thumb contain a total of 14 phalanges. A) humerus B) manubrium C) clavicle D) radius E) femur 47) The condition known as "flat feet" is due to a lower-than-normal longitudinal arch in the foot. In the fresh state its upper part is covered with a thin layer of cartilage, lined by a prolongation of the synovial membrane of the shoulder-joint; its lower portion gives insertion to the tendon of the latissimus dorsi muscle. Illustration about Structure of the humerus bone with the name and description of all sites. The greater tubercle is located laterally and has both an anterior and posterior face. The other muscles are used as counterbalances for the actions of lifting/pulling and pressing/pushing. The structure of a long bone allows for the best visualization of all of the parts of a bone ().A long bone has two parts: the diaphysis and the epiphysis.The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. Humerus. Above the front part of the capitulum is a slight depression, the radial fossa, which receives the anterior border of the head of the radius, when the forearm is flexed. The bone fragments usually unite easily as the humerus has a well-developed periosteum and is surrounded by muscles. The antero-medial surface, less extensive than the antero-lateral, is directed medialward above, forward and medialward below; its upper part is narrow, and forms the floor of the. Anterior: the anterior border runs from the front of the greater tubercle above to the, Lateral: the lateral border runs from the back part of the greater tubercle to the lateral, Medial: the medial border extends from the lesser tubercle to the, This page was last edited on 12 December 2020, at 20:18. 0.01 points Humerus Proximal epiphysis eBook Shaft (diaphysis) References Lateral epicondyle Medial epicondyle Head Deltoid tuberosity Distal epiphysis Reset Zoom Your humerus is the long bone in your upper arm that's located between your elbow and shoulder. Humerus is the largest of the bones in the arm. You need to get 100% to score the 9 points available. The posterior surface appears somewhat twisted, so that its upper part is directed a little medialward, its lower part backward and a little lateralward. Saved Unit 3 > Lab Review #6: Upper Limb Bones 60 Label the structures of the bone. At the shoulder, the head of the humerus articulates with the glenoid fossa of the scapula. Dislocation of the humerus's glenohumeral joint has the potential to injure the axillary nerve or the axillary artery. Long bone type in the upper arm. Structure of an adult human long bone. Get started! Last medically reviewed on January 20, 2018, The adductor hallucis is a two-headed muscle that is responsible for flexing and contracting the big toe, and reinforcing the arch of the foot. Signs and symptoms of this dislocation include a loss of the normal shoulder contour and a palpable depression under the acromion. Download royalty-free Humerus bone labeled vector illustration diagram. Skeleton anatomy scheme with greater tubercle, deltoid tuberosity, medial epicondyle, trochlea and other parts. Both these tubercles are found in the proximal part of the shaft. Left elbow-joint, showing anterior and ulnar collateral ligaments. The inferior boundary of the spiral groove is continuous distally with the lateral border of the shaft. During embryonic development, the humerus is one of the first structures to ossify, beginning with the first ossification center in the shaft of the bone. The deltoid originates on the lateral third of the clavicle, acromion and the crest of the spine of the scapula. The Capitulum is a rounded eminence forming the lateral part of the distal humerus. The supraspinatus also originates on the spine of the scapula. The left shoulder and acromioclavicular joints, and the proper ligaments of the scapula. This is located posteroinferior to the deltoid tuberosity. One of us! 46) What bone articulates on the structure labeled "2"? Product #: gm1209851458 $ 12.00 iStock In stock These adductors are assisted…, A thin strip of tissue, the multifidus muscle starts at the sacral bone at the base of the spine and extends up to the axis, which is commonly…, The opponens digiti minimi is a triangular muscle in the hand. The pectoralis major, teres major, and latissimus dorsi insert at the intertubercular groove of the humerus. The grooved portion of the articular surface fits accurately within the semilunar notch of the ulna; it is broader and deeper on the posterior than on the anterior aspect of the bone, and is inclined obliquely downward and forward toward the medial side. An intercondylar fracture can occur due to a fall on the elbow whilst it is in flexion. It makes contact with the axillary nerve and the posterior humeral circumflex artery. Above the back part of the trochlea is a deep triangular depression, the olecranon fossa, in which the summit of the olecranon is received in extension of the forearm. Because it connects at the shoulder with a rotational joint, the humerus is instrumental in supporting many of the arm’s functions. [6] The medial humeral head develops an ossification center around 4 months of age and the greater tuberosity around 10 months of age. The posterorsuperior part of the shaft has a crest, beginning just below the surgical neck of the humerus and extends till the superior tip of the deltoid tuberosity. The triceps brachii and anconeus extend the elbow, and attach to the posterior side of the humerus. Illustration of chart, healthy, graphic - 148818079 [citation needed]. The process of ossification is complete by 13 years of age, though the epiphyseal plate (growth plate) persists until skeletal maturity, usually around 17 years of age. The nutrient foramen of the humerus is located in the anteromedial surface of the humerus. The humeral upper extremity consists of a rounded head, a narrow neck, and two short processes (tubercles, sometimes called tuberosities). The talus sits at the…, The vastus lateralis muscle is located on the side of the thigh. Human anatomy. Structure of human bones explained Deep dissection. Your humerus consists of several parts that allow you to move your arm in different directions. Elbow joint. Humerus - inferior epiphysis. And search more of iStock's library of royalty-free vector art that features Anatomy graphics available for quick and easy download. Today's Rank--0. It is deep and narrow above, and becomes shallow and a little broader as it descends. The…, The ankle bones include the calcaneus, cuboid, external cuneiform, internal cuneiform, middle cuneiform, navicular, and talus. 15. Swipe for labels. Posterior view. Surrounding the entire bone is the fibrous periosteum layer that provides a thin, yet strong connecting material for the tendons and ligaments that bind the humerus to muscles and other bones. Posterior view. At the midshaft of the humerus, the radial nerve travels from the posterior to the anterior aspect of the bone in the spiral groove. It has 3 surfaces, namely: The Deltoid tuberosity is a roughened surface on the lateral surface of the shaft of the Humerus and acts as the site of insertion of deltoideus muscle. 2. At the shoulder, the humerus connects to the frame of the body via the glenoid fossa of the scapula. This means it is also one of the most commonly broken or fractured. A fracture of the humerus in this region can result in radial nerve injury. The diameter of the humeral head is generally larger in men than in women. 2. It runs obliquely downward, and ends near the junction of the upper with the middle third of the bone. The brachial artery travels most of the bone’s length, before it subdivides into the ulnar and radial arteries at the elbow. Projecting on either side are the lateral and medial epicondyles. Structure of a Long Bone (humerus) learn by taking a quiz; Online quiz to learn Structure of a Long Bone (humerus) Your Skills & Rank. The upper extremity consists of a rounded head, a narrow neck, and two short processes (tubercles, sometimes called tuberosities). Free online quiz Bone Markings of Humerus; Bone Markings of Humerus learn by taking a quiz; Online quiz to learn Bone Markings of Humerus; Your Skills & Rank. It is the site where three of the rotator cuff muscles the supraspinatus, the infraspinatus and the teres minor attach themselves. The humerus is the foundation to which many muscles insert, such as the deltoid, the pectoralis major, and others. At its proximal end is the head of the humerus. [2] It is inserted on the deltoid tuberosity of the humerus and has several actions including abduction, extension, and circumduction of the shoulder. The head (caput humeri), is nearly hemispherical in form. The body is cylindrical in its upper portion, and more prismatic below. Posterior aspect. Above and in front it presents an impression for the insertion of the tendon of the subscapularis muscle. A problem with which of the following would most likely contribute to this condition? It is located between the elbow joint and the shoulder. Humerus Bone Quiz – Anterior Markings. [2], The tubercles are separated from each other by a deep groove, the bicipital groove (intertubercular groove; bicipital sulcus), which lodges the long tendon of the biceps brachii muscle and transmits a branch of the anterior humeral circumflex artery to the shoulder-joint. Capsule of elbow-joint (distended). Back and front view. The Lateral Supracondylar crest forms the sharp lateral border of the distal humerus continuing superiorly from the lateral epicondyle.[3]. The humerus is the single bone of the arm region (Figure 8.2.1). The lateral surface of the greater tubercle is convex, rough, and continuous with the lateral surface of the body.[2]. Anterior view. The infraspinatus and teres minor insert on the greater tubercle, and work to laterally, or externally, rotate the humerus. The humerus is a long bone in the arm that runs from the shoulder to the elbow. Game Points. The lesser tuberosity, is more prominent than the greater: it is situated in front, and is directed medialward and forward. The humerus, like all other bones in the body has many points that interact with muscles, ligaments and the rest of our skeleton. Endangered structures Humerus bone labeled vector illustration diagram. Long bone type in the upper arm. Elbow joint. 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