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Anatomical variation of radial wrist extensor muscles: a study in cadavers.

Nayak SR, Krishnamurthy A, Prabhu LV, Rai R, Ranade AV, Madhyastha S - Clinics (Sao Paulo) (2008)

Bottom Line: In one of the right upper limbs, two additional muscles were found.The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone.The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy, Kasturba Medical College, Karnataka, India. ranjanbhatana@gmail.com

ABSTRACT

Objective: The tendons of the extensor carpi radialis longus and brevis muscles are quite useful in tendon transfer, such as in correction of finger clawing and restoration of thumb opposition. Knowledge of additional radial wrist extensor muscle bellies with independent tendons is useful in the above-mentioned surgical procedures.

Methods: The skin, subcutaneous tissue, and antebrachial fascia of 48 (24 on the right side and 24 on left side) male upper limb forearms were dissected. The following aspects were then analyzed: (a) the presence of additional muscle bellies of radial wrist extensors, (b) the origin and insertion of the additional muscle, and (c) measurements of the muscle bellies and their tendons.

Results: Five out of 48 upper limbs (10.41%) had additional radial wrist extensors; this occurred in 3 out of 24 left upper limbs (12.5%) and 2 out of 24 right upper limbs (8.3%). In one of the right upper limbs, two additional muscles were found. The length and width of each additional muscle belly and its tendon ranged between 2 - 15 cm by 0.35 - 6.4 cm and 2.8 - 20.8 cm by 0.2 0.5 cm, respectively. The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone.

Conclusion: The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

Show MeSH
Extensor compartment of the left forearm and hand region. TECRB into B2/3M, tendon of extensor carpi radialis brevis inserted into the base of the second and third metacarpal bones; TECRL into B2M, tendon of extensor carpi radialis longus inserted into the base of the second metacarpal bone. Note that the downward arrows indicate the course of the additional muscle. The muscle was inserted into the tendon of the ECRB.
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f4-cln63_1p0085: Extensor compartment of the left forearm and hand region. TECRB into B2/3M, tendon of extensor carpi radialis brevis inserted into the base of the second and third metacarpal bones; TECRL into B2M, tendon of extensor carpi radialis longus inserted into the base of the second metacarpal bone. Note that the downward arrows indicate the course of the additional muscle. The muscle was inserted into the tendon of the ECRB.

Mentions: Out of 48 upper limbs studied, five (10.41%) had additional RWE (Fig 1, 2, 3a, 3b, 4, 5). Three out of 24 left upper limbs (12.5%) and 2 out of 24 right upper limbs (8.3%) had additional RWE. In one of the right upper limbs, there were two additional muscles found (Fig 3a, 3b). The length and width of each additional muscle belly and its tendon are mentioned in Table 1.


Anatomical variation of radial wrist extensor muscles: a study in cadavers.

Nayak SR, Krishnamurthy A, Prabhu LV, Rai R, Ranade AV, Madhyastha S - Clinics (Sao Paulo) (2008)

Extensor compartment of the left forearm and hand region. TECRB into B2/3M, tendon of extensor carpi radialis brevis inserted into the base of the second and third metacarpal bones; TECRL into B2M, tendon of extensor carpi radialis longus inserted into the base of the second metacarpal bone. Note that the downward arrows indicate the course of the additional muscle. The muscle was inserted into the tendon of the ECRB.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2664178&req=5

f4-cln63_1p0085: Extensor compartment of the left forearm and hand region. TECRB into B2/3M, tendon of extensor carpi radialis brevis inserted into the base of the second and third metacarpal bones; TECRL into B2M, tendon of extensor carpi radialis longus inserted into the base of the second metacarpal bone. Note that the downward arrows indicate the course of the additional muscle. The muscle was inserted into the tendon of the ECRB.
Mentions: Out of 48 upper limbs studied, five (10.41%) had additional RWE (Fig 1, 2, 3a, 3b, 4, 5). Three out of 24 left upper limbs (12.5%) and 2 out of 24 right upper limbs (8.3%) had additional RWE. In one of the right upper limbs, there were two additional muscles found (Fig 3a, 3b). The length and width of each additional muscle belly and its tendon are mentioned in Table 1.

Bottom Line: In one of the right upper limbs, two additional muscles were found.The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone.The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy, Kasturba Medical College, Karnataka, India. ranjanbhatana@gmail.com

ABSTRACT

Objective: The tendons of the extensor carpi radialis longus and brevis muscles are quite useful in tendon transfer, such as in correction of finger clawing and restoration of thumb opposition. Knowledge of additional radial wrist extensor muscle bellies with independent tendons is useful in the above-mentioned surgical procedures.

Methods: The skin, subcutaneous tissue, and antebrachial fascia of 48 (24 on the right side and 24 on left side) male upper limb forearms were dissected. The following aspects were then analyzed: (a) the presence of additional muscle bellies of radial wrist extensors, (b) the origin and insertion of the additional muscle, and (c) measurements of the muscle bellies and their tendons.

Results: Five out of 48 upper limbs (10.41%) had additional radial wrist extensors; this occurred in 3 out of 24 left upper limbs (12.5%) and 2 out of 24 right upper limbs (8.3%). In one of the right upper limbs, two additional muscles were found. The length and width of each additional muscle belly and its tendon ranged between 2 - 15 cm by 0.35 - 6.4 cm and 2.8 - 20.8 cm by 0.2 0.5 cm, respectively. The additional radial wrist extensor tendons in our study basically originated either from the extensor carpi radialis longus or brevis muscles and were inserted at the base of the 2nd or 3rd metacarpal bone.

Conclusion: The present study will inform surgeons about the different varieties of additional radial wrist extensors and the frequency of their occurrence.

Show MeSH