As the … 2. 15. The insertion is bilaminar. The medial epicondyle is smaller than the medial epicondyle. When you are taking anatomy and physiology you will be required to know the anatomical structure locations of the humerus bone. The upper end ossifies from 3 secondary centers—one for the head (first year), one for the greater tubercle (second year), and one for the lesser tubercle (fifth year). 4. The humeral upper extremity consists of a rounded head, a narrow neck, and two short processes. Anatomy of Long Bones ! The medial supracondylar ridge is a similar ridge on the medial side. What bone does the trochlea of the humerus articulate with? The humerus is the bone of the arm. It is located between the anterior and lateral borders. It connects the scapula and the two bones of the lower arm, the radius and ulna, and consists of three sections. Muscles of the shoulder and arm attach to the humerus permitting arm to flex and extend at elbow. It articulates with the trochlear notch of the ulna. You must sign in or sign up to start the quiz. At the elbow, it connects primarily to the ulna, as the forearm's radial bone … 7. It accommodates the head of the radius when the elbow is flexed. The humerus is a long bone (Based on the types of bones). Its upper part is marked by an oblique ridge. The brachialis arises from the lower halves of the anteromedial and anterolateral surface of the shaft. The articular part includes the following. The greater tubercle of the humerus is one of the most lateral components of the proximal end of the humerus. It articulates along with the glenoid cavity of the scapula to create the glenohumeral (shoulder) joint. The entire posterior surface below the spiral groove offers an origin to the medial head of the triceps brachii. (a) The tendon of the long head of the biceps brachii, and its synovial sheath. About its middle, it presents a rough strip. Its posterosuperior aspect carries three flattened facet-like impressions: upper, middle, and lower, that provide connection to supraspinatus, infraspinatus, and teres minor muscles, respectively. The Humerus is referred to as the bone of the arm and sometimes commonly referred to as the funny bone. Articulates with trochlear notch of ulnar, medial side. The teres major is inserted into the medial lip of the intertubercular sulcus. 4. The lesser tubercle of the humerus is minor elevation on the front of the upper end of the humerus, just above the surgical neck. The lower component of this border, lateral supracondylar ridge, provides attachment to the lateral intermuscular septum. The Intertubercular Sulcus of the humerus is a vertical groove between lesser and greater tubercles. In the middle part, it is interrupted by the radial or spiral groove. The morphological neck of the humerus is the junction between diaphysis and epiphysis. 11. 3. Its anterolateral part has a muscular impression. It is continuous below with the medial supracondylar ridge. It articulates with the glenoid cavity of the scapula to form the shoulder joint. Radius and ulna (4): Radius is the shorter of two bones present in forearm. It has an upper end, a lower end, and a shaft. window.location.href = x+'?dc=arms-bones-interface&rm=true'; It consists of (a) long head of biceps, wrapped in the synovial sheath and (b) ascending branch of. The multipennate subscapularis is inserted into the lesser tubercle. 10. The pectoralis major is inserted into the lateral lip of the intertubercular sulcus. You have already completed the quiz before. The medial edge of the trochlea projects down 6 mm more than the lateral edge: This results in the formation of the carrying angle. The shaft of the humerus is cylindrical in the upper half but flattened anteroposteriorly in the lower half. The ‘L’ of lady stands for latissimus dorsi and ‘2M’ stands for pectoralis major and teres major. About its middle and close to the medial border, it presents a nutrient foramen directed downwards. The anatomical region of the shoulder is made up of the union of three bones : humerus , scapula, and clavicle . The coronoid process of ulna fits into coronoid fossa (above the trochlea) during full flexion of the elbow. Its anterolateral part has a muscular impression. Humerus. The upper half of this surface is covered by the deltoid. Many muscles which manipulate the arm, at the forearm, at the elbow and the shoulder are anchored to the humerus bone. What deformity occurs if there is damage to the radial nerve? The upper part of this surface forms the floor of the intertubercular sulcus. Non-union of fracture of the humerus is common, if the fracture occurs at the junction of its upper one-third and middle one-third as a result of poor blood supply. The upper end of humerus provides the following 5 features: The head is smooth and rounded, and forms less than a fraction of a sphere. In the upper one-third of this surface, generally there is an oblique ridge directed downwards and laterally. The humerus is the bone of the arm. The pronator teres (humeral head) arises from the lower one-third of the medial supracondylar ridge. In some cases, a bony bar between the coronoid and olecranon fossae is perforated and forms supratrochlear. Articular cartilage- covers surface of epiphysis to reduce }. It contains the following features: The humerus is ossified by the following ossification centres: Nerves directly related to the humerus: The three nerves(axillary, radial, and ulnar) are closely related to the back of humerus as follows: Therefore, these nerves are often involved in the fracture of the humerus at the above sites: Common sites of fracture of the humerus: These are (a) surgical neck, (b) shaft, and (c) supracondylar region. The extensor carpi arise from the lower one-third of the lateral supracondylar ridge. The Humerus is referred to as the bone of the arm and sometimes commonly referred to as the funny bone. Part of the area extends onto the posterior aspect. It is located between the anterior and medial borders. The region articulates forming part of the shoulder joint. The shaft is rounded in the upper half and triangular in the lower half. The lower extremity consists of 2 … Humerus bone quiz for anatomy and physiology! It is the longest bone of the upper limb. The lesser tubercle, greater tubercle, and vertical groove (intertubercular groove) at the upper end faces anteriorly. Below and medial to the ridge, is the radial/spiral groove, which lodges radial nerve and profunda brachii vessels. In the upper surface of the greater tubercle. It is directed medially backwards and upwards. It extends from the medial lip of the intertubercular sulcus down to the medial epicondyle. The head forms about one-third of a sphere and is much larger than the glenoid cavity. 14. It is the only bone in the arm It is a long bone The Humerus 4. The lower end of the humerus is flattened from before backwards and expanded from side to side. The lower end ossifies from 4 centers which form 2 epiphyses. The contents of the intertubercular sulcus are: The humerus is a long bone in the arm that runs from the shoulder to the elbow. Clinically it provides as the backward displacement of the lower fragment with an unduly prominent elbow, on the other hand, the three bony points of the elbow (viz. The head of the radius fits into radial fossa (above capitulum) during full flexion of the elbow. The humerus is the longest and strongest bone in the upper limb The Humerus 3. The supraspinatus is inserted into the uppermost impression on the greater tubercle. It is related to the axillary nerve and posterior and anterior circumflex humeral vessels. The coronoid fossa is a depression just above the anterior aspect of the trochlea. It accommodates the coronoid process of the ulna when the elbow is flexed. var x = document.URL; ﬁ brous and cellular tissue lining the medullary cavity of the bone. The center for the medial epicondyle appears during 4-6 years, from a separate epiphysis, and fuses with the shaft during the 20th years. Hence you can not start it again. The capsule of the elbow joint is connected above the coronoid and radial fossae anteriorly and above the olecranon fossa posteriorly. It consists of a proximal end, a shaft and a distal end, all which contain important anatomical landmarks. It is located between the elbow joint and the shoulder. The shaft of the humerus has three borders and three surfaces. Its upper one-third is narrow and forms the floor of the intertubercular sulcus. Teres major on the medial lip of the groove. The radial fossa is a depression present just above the anterior aspect of the capitulum. 3. It accommodates the olecranon process of the ulna when the elbow is extended. Pectoral girdle (shoulder joint) Humerus (2): It is the longest and the largest bone of the upper limb. It has an upper end, a lower end, and a shaft. Example: Femur, humerus . 136 Anatomy and physiology of domestic animals one another via connections containing gap junctions. It is composed of three components: upper end, a lower end, and a shaft. The head is directed medially, backward, and upwards. It is a true junction of the head with the shaft. The median nerve is most commonly associated with the supracondylar fracture of the humerus. The humerus is the largest bone of the upper extremity and defines the human brachium (arm).
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