[3], The deltoid tuberosity develops through endochondral ossification in a two-phase process. In cursorial (running) animals such as the pronghorn, the deltoid tubercle is located about a quarter of the way down the shaft, which allows for rapid but relatively weak limb flexion and extension. Reports of deltoid tuberosity fracture are rare. In natatorial (swimming) animals such as the North American river otter, the tubercle is located nearly halfway down the shaft, which allows for powerful limb flexion and extension. The size and orientation of its functionally important features, including the deltoid tubercle, greater tubercle, and medial epicondyle, are pivotal to an animal's style of locomotion and habitat. Start studying Tuberosity Locations. The development of this structure, through endochondral ossification, occurs in two phases: As aforesaid, it is the site of attachment for the deltoid muscle. Deltoid tuberosity Anatomy. The size and orientation of its functionally important features, including the deltoid tubercle, greater tubercle, and medial epicondyle, are pivotal to an animal's style of locomotion and habitat. (Deltoideus labeled at center right. It is also known as the 'common shoulder muscle', particularly in other animals such as the domestic cat. It is vertically oblong in appearance. (adsbygoogle = window.adsbygoogle || []).push({}); © 2020 Human Anatomy. Anatomically, it appears to be made up of three distinct sets of fibers, namely 1. anterior or clavicular part (pars clavicularis) 2. posterior or scapular part (pars scapularis) 3. intermediate or acromial part (pars acromialis). [2], It has been reported as very prominent in less than 10% of cases. Deltoid Muscle: Location and Actions. It appears as a rough, triangular region in human anatomy. The deltoid is a round muscle that goes around the top of your upper arm and shoulder. The tuberosity can be very pronounced in fossorial (digging) animals, such as the mountain beaver. In cursorial (running) animals such as the pronghorn, the deltoid tubercle is located about a quarter of the way down the shaft, which allows for rapid but relatively weak limb flexion and extension. The word “Tuberosity” comes from the term “Tuber” which is of Latin origin and means “A lump.”. The deltoid muscle is the muscle forming the rounded contour of the human shoulder. ... portions converge into a thick tendon which inserts on the lateral surface of the humerus near its midpoint at the deltoid tuberosity. The development of this structure, through endochondral ossification, occurs in two … Learn vocabulary, terms, and more with flashcards, games, and other study tools. 9,10 The superficial location of the deltoid tuberosity places it at risk of traumatic injury, fracture, and sequestration. The main function of the deltoid is to help you lift and rotate … [4], In mammals, the humerus displays a wide morphological variation. In mammals, the humerus displays a wide morphological variation. In natatorial (swimming) animals such as the North America… It is vertically oblong in appearance. The deltoid originates at the anterior border and upper surface of the lateral third of the clavicle, acromion, and spine of the scapula. Deltoid Tuberosity Fracture Etiology and Diagnosis. ), "The deltoid tuberosity--a potential pitfall (the "delta sign") in bone-scan interpretation: concise communication", "Bone ridge patterning during musculoskeletal assembly is mediated through SCX regulation of Bmp4 at the tendon-skeleton junction", https://en.wikipedia.org/w/index.php?title=Deltoid_tuberosity&oldid=984871467, Creative Commons Attribution-ShareAlike License, This page was last edited on 22 October 2020, at 16:19. It refers to a bumpy area on the shaft of the humerus which the deltoid muscle is attached to. All Rights Reserved. Affected horses often have evidence of wounds or soft tissue swelling over the lateral aspect of the humerus. Deltoid tuberosity of the humerus (at the beginning of the upper half of the humerus on the lateral side [1] Functions (Actions) The anterior head flexes and medially (internally) rotates the arm at the shoulder joint. [5], Bony projection on the humerus where the deltoid muscle inserts, Left humerus. The deltoid muscle was named after the … Take a look at these pictures to know how this bony region appears to view. http://en.wikipedia.org/wiki/Deltoid_tuberosity, http://www.ebi.ac.uk/QuickGO/GTerm?id=GO:0035993, http://www.merriam-webster.com/medical/deltoid%20tuberosity, Last updated on November 14th, 2018 at 8:05 pm. It appears as a rough, triangular region in human anatomy. The middle head abducts (elevates laterally) the arm at the shoulder joint. However, electromyographysuggests that it consists of at least seven groups that can be in… The deltoid is a muscle of the shoulder. It is also known by various other names, such as: It is found on the lateral edge of the mid-humeral shaft. Anterior view. The initiating signal is tendon-dependent, whilst the growth phase is muscle-dependent.
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