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Encyclopedia > Triceps brachii muscle
Triceps brachii
Triceps brachii
Latin musculus triceps brachii
Gray's subject #124 444
Origin long head: scapula
lateral head: posterior humerus
medial head: posterior humerus
Insertion    olecranon process of ulna
Artery: deep brachial artery
Nerve: radial nerve
Action: extends forearm, caput longum adducts shoulder
Antagonist: Biceps brachii muscle
Dorlands
/Elsevier
m_22/12551300

The triceps brachii muscle is a muscle of the posterior compartment of the upper limb. It is the muscle principally responsible for extension of the elbow joint. Image File history File links Triceps brachii muscle Original by sv:Användare:Chrizz, 28 maj 2005 compressed with pngcrush File links The following pages link to this file: Triceps brachii muscle ... For other uses, see Latins and Latin (disambiguation). ... A typical adult human skeleton consists of the following 206 bones depending on age, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ... The humerus is a long bone in the arm or fore-legs (animals) that runs from the shoulder to the elbow. ... A typical adult human skeleton consists of the following 206 bones depending on age, though this number does vary owing to a variety of anatomical variations; for example, a small portion of the human population have an extra rib, or an extra lumbar vertebra. ... ... The ulna (Elbow Bone) [Figs. ... For other uses, see Artery (disambiguation). ... Right upper limb, anterior view, brachial artery and elbow. ... List of human nerves External links List of nerves This is an incomplete list, which may never be able to satisfy certain standards for completeness. ... The radial nerve is a nerve in the human body, that supplies the arm, the forearm and the hand. ... Look up kinesiology in Wiktionary, the free dictionary. ... Anatomical planes in a human. ... // The Human Forearm The forearm is the structure on the upper limb, between the elbow and the wrist. ... Anatomical planes in a human Adduction is a movement which brings a limb - arm or leg - closer to the body in the sagittal plane. ... This article is about the body part. ... An antagonist is a kind of muscle that acts in opposition to the movement generated by the agonist and is responsible for returning a limb to its initial position. ... In human anatomy, the biceps brachii is a muscle located on the upper arm. ... Elseviers logo. ... In humans, the upper limb is an anatomical term for the limb that is attached to the pectoral girdle. ... For the band, see Elbow (band). ...

Contents

Etymology

Triceps is Latin for 'three-headed', reflecting the three parts of this muscle. Brachii means 'of the arm'. Triceps brachii is often called the triceps (both singular and plural). However, some authors describe the triceps surae muscle, and so this term is somewhat ambiguous. For other uses, see Latins and Latin (disambiguation). ... The triceps surae a term given by some anatomists to the gastrocnemius and soleus muscles together as they both insert into the calcaneus, the bone of the heel of the human foot, and from the major part of the muscle of the back part of the lower leg (the calf...


Origin and insertion

The three heads have the following names and origins:

The fibers converge to a single tendon to insert onto the olecranon process of the ulna (though some research indicates that there may be more than one tendon.)[1] The infraglenoid tubercle is the part of the scapula to which the long head of the triceps brachii attaches. ... Left scapula - front view () Left scapula - rear view () In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (arm bone) with the clavicle (collar bone). ... The body or shaft of the humerus is almost cylindrical in the upper half of its extent, prismatic and flattened below, and has three borders and three surfaces. ... The center of the lateral border of the humerus is traversed by a broad but shallow oblique depression, the radial sulcus (musculospiral groove, radial groove, spiral groove). ... The body or shaft of the humerus is almost cylindrical in the upper half of its extent, prismatic and flattened below, and has three borders and three surfaces. ... The olecranon is a large, thick, curved eminence, situated at the upper and back part of the ulna. ... The ulna (Elbow Bone) [Figs. ...


Many mammals have a fourth head, the "Accessory head", which is between the Lateral and Medial heads.

Image File history File links Question_book-3. ...

Actions

The triceps is an extensor muscle of the elbow joint, and is an antagonist of the biceps and brachialis muscles. It can also fixate the elbow joint when the forearm and hand are used for fine movements, eg when writing. An extensor muscle is any skeletal muscle that opens a joint increasing the angle between components of a limb, such as straightening the knee or elbow and bending the wrist or spine. ... Look up Biceps in Wiktionary, the free dictionary. ... Brachialis is a flexor muscle in the upper arm. ...


The triceps accounts for approximately 70 percent of the upper arm's muscle mass.


Training

The triceps can be worked through either isolation elbow extension movements, contract statically to keep the arm straightened against resistance, or compound pressing movements.


Isolation movements include cable push-downs, "skull-crushers", and arm extensions behind the back.


Static contraction movements are pullovers, straight-arm pulldowns, and bent-over lateral raises, which are also used to build the butt deltoids and latissimus dorsi.


Examples of pressing movements are press ups, bench presses (level, incline or decline), military presses and dips. Using a closer grip stabilizes the arm allowing more weight to be used, so the triceps can be worked harder without being limited by the strength of the pectorals or shoulders.


Elbow extension is important to many athletic activities. As biceps are often worked more for aesthetic purposes, this is usually a mistake for fitness training. While it is important to maintain a balance between the biceps and triceps for postural & effective movement purposes, what the balance should be and how to measure it is a conflicted area. Pushing and pulling movements on the same plane are often used to measure this ratio.


Additional images

See also

  • Triceps reflexblah

References

  1. ^ Madsen M, Marx R, Millett P, Rodeo S, Sperling J, Warren R (2006). "Surgical anatomy of the triceps brachii tendon: anatomical study and clinical correlation.". Am J Sports Med 34 (11): 1839-43. doi:10.1177/0363546506288752. PMID 16735585. 

A digital object identifier (or DOI) is a standard for persistently identifying a piece of intellectual property on a digital network and associating it with related data, the metadata, in a structured extensible way. ...

External links

The lumbrical muscles are intrinsic muscles in the fingers that allow flexion at the metacarpophalangeal joints, while maintaining extension at the interphalangeal joints. ... The dorsal interossei of the hand are muscles that occupy the space between the metacarpals. ... The Palmar interossei muscles is a muscle of the human body. ...

  Results from FactBites:
 
Triceps Brachii (136 words)
The biarticulate long head of the triceps brachii [1 ] enters passive insufficiency through the completion of elbow flexion when the shoulders are more flexed and abducted or through the completion of shoulder flexion and abduction when the elbows are more flexed.
The biarticulate long head of the triceps brachii [1 ] enters active insufficiency through the completion of elbow extension when the shoulders are more extended and adducted (other heads of the triceps becomes more active) or through the completion of shoulder extension and adduction when the elbows are more extended.
When the shoulder is internally rotated, the ability of the long head of the triceps brachii to extend and adduct the shoulder is diminished.
  More results at FactBites »

 
 

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