Biomecanica Basica Nordin COMPLETO – Free ebook download as PDF File . pdf) or read book Miralles – biomecanica clinica del aparato Miralles Biomecanica Clinica Del Aparato Locomotor – Download as PDF File .pdf) or read online. dfdscz. Biomecánica clĂ­nica de los tejidos y las articulaciones del aparato locomotor: : Rodrigo C. Miralles Marrero, Iris Miralles Rull: Books.

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Abductor pollicis brevis muscle; Thenar eminence; Thumb; Movement of the thumb.

Abductor pollicis brevis; Eminencia tenar; Pulgar; Movimientos del pulgar. The differentiation from prehominids Australophitecus afarensis to hominids Homo habilis is due to the use of tools, which was only possible through the development of the brain and the opposition of the thumb precision gripbeing considered as evolutionary characteristics.

rodrigo miralles biomecanica pdf

In relation to the human thumb, when we look at its constitution, strength, and fine motor control of their movements, we found six different muscles that are interrelated, prepared prior to the metacarpophalangeal joint: These actions are explained from the relationship and trajectory of the APB muscle on carpometacarpal and metacarpophalangeal joints of the thumb, which are traversed by that muscle.

With regard to form, the APB is a fusiform muscle; it is flat, thin, and triangular and located at the surface of the thenar eminence, which is characterized by a thick skin, adherent and hairless, adhering to thenar fascia superficial through fibrous layers circumscribing in adipose clusters. This muscle is related in the background with the opponens pollicis muscle OPwhich lies below and laterally, and the FPBsup, which lies inferiorly and medially.

The fourth plane, and deeper, consists of the AP muscle, consisting of a transverse and one oblique bundle. The thenar branch of the median nerve is responsible for supplying the APB muscle innervations and the other thenar muscles Olave et al. Both the APB and FPB muscles, as described, have a large number of small motor units, consistent with the observations of authors, such as Chan et al.

In the clinical setting, the APB muscle was used for assessment, diagnosis, and treatment of various diseases and dysfunctions, such as dynamometry tests Liu et al. The case reported describes the APB muscle and its relationship with neighboring anatomical structures. In a male cadaver preserved through glycerin, belonging to the Morphology Laboratory, Department of Basic Biomedical Sciences, Universidad de Talca, during routine dissection of the left thenar region, we observed an unusual variation to APB muscle; therefore, the muscle was carefully dissected, preserving the whole of it, as well as its attachments and surrounding anatomical structures.

The skin, subcutaneous layer, and subdermal adipose tissue were removed to make the APB muscle visible. In anatomical position, the APB muscle was found miralled close relation to the palmar fascia, surrounded by abundant adipose tissue in the superficial plane to the FPBsup and OP muscles. Of these, the first mjralles located medially and deep enough to be visible almost in totality, as opposed to the OP muscle, mialles is covered in a lateral plane and located in a deep miralles, although it can still be observed from a sagittal view.


Finally, the AP represents the fourth and deeper muscle levels of the thumb, conformed for an oblique fascicle and a transverse fascicle Fig. Fascicles and relationships of abductor pollicis brevis muscle. The APB muscle, with its fusiform shape, shows two fascicles that are arranged one above the other, connected by a loose areola tissue for easy removal.

The superficial portion of the APBsup muscle is closely linked to the adipose and dermal tissues, receiving aponeurotic expansions of the tendinous portion of the PL muscle, the palmar aponeurosis, and the APL tendon Fig. The APBdeep muscle passes medially to the superficial region.

With its flattened appearance, the APBdeep muscle thins as it approaches the mirallees site; this issue does not receive tendinous expansions. Connective tissue expansions of APB muscle: The remaining inserts are part of the deep fascicle APBdeep of the APB muscle, which are directed to the APL tendon, scaphoid tuberosity, flexor retinaculum, and tubercle of the trapezium.

Both the ABPsup and APBdeep muscles are inserted distally on the lateral tubercle of the base of the proximal phalanx of the thumb sesamoid bone and dorsal expansion Fig.

The APBsup muscle fibers are oriented parallel and slightly lateral to the APBdeep muscle fibers with a lower volume relative to its counterpart, being separated by a thin connective tissue and easily removed.

The presence of variations in the arrangement of the thenar muscles is common in modern humans miraples higher primates.

For Susman, the greater variability in these species is observed in the deep fascicles of the FPL and FPB muscles; these variations are probably greater specialization relationships that upper hominids acquired through the thumb and the hand. In our study, we reported a change in the structure of the APB muscle, which has a bifascicular structure. For him, when you have this variation, the fibers form a superficial portion that is oriented above the deep fascicle of the ABS APBdeepand the latter by about the FPBsup muscle.

Thus, the functional contribution varies in mirallez cases.

Napier said that the provision of the APB muscle, longitudinal along the axis, allows the separation of the metacarpal or proximal phalanx abduction and medial rotation addition because of its insertion into the dorsal expansion.

These authors measured the electromyographic activity of the APB muscle and deep fascicle of the APL muscle in various positions of the thumb and hand, obtaining the conclusion that the ABS muscle is activated by the movements of the hand to maintain tension deep fascicle of APL and the movements of the thumb to prevent undesired movements of the hand and forearm.


In this case, an APB muscle with two fascicles, one superficial establishing close relation with the tegument of the thenar region and other deep subfascial location and morphology similar to the APB muscle in its classic description, was presented. The influence that this disposition is on the clinical behavior of the APB muscle is unclear, so it is necessary to develop biomechanical and electromyographic studies to elucidate the functional aspects of these two muscle fascicles.

Variations in the motor nerve supply of the thenar and hypothenar muscles of the hand. Motor units and functional anatomy of the human musculus opponens digiti minimi.

Contractile properties of human motor units in health, aging, and disease. Muscle Nerve, 24 9: Palmaris longus, anteductor of the thumb. Pocket Atlas of Human Anatomy. Based on the International Nomenclature.

rodrigo miralles biomecanica pdf

Radial collateral ligament repair of the thumb metacarpophalangeal joint using the abductor pollicis brevis tendon. Use of quantitative abductor pollicis brevis strength testing in patients with carpal tunnel syndrome. Barcelona, Editorial Masson, The The attachments and function of the abductor pollicis brevis. Distribution patterns of the muscular branch of themedian nerve in the thenar region.

Morphometric studies of the muscular branch of the median nerve. Number and size of motor units in thenar muscles. Human abductor pollicis brevis muscle divisions and the nerve hila. Fossil evidence for early hominid tool use. Functional relationship between the abductor pollicis longus and abductor pollicis brevis muscles: Carpal tunnel syndrome and manual work: Abductor pollicis brevis muscle APB belongs to the foreground of the subfascial muscle thenar region, which is of great importance in the movement of the thumb on its two-joint arrangement.

In this article, we report the presence of bikmecanica superficial portion of the APB muscle and its relationship and discuss the available literature and the clinical implications of the presence of this variation.

CASE REPORT In a male cadaver preserved through mirales, belonging to the Morphology Laboratory, Department of Basic Biomedical Sciences, Universidad de Talca, during routine dissection of the left thenar region, we observed an unusual variation to APB muscle; therefore, the muscle was carefully dissected, preserving the whole of it, as well as its attachments and surrounding anatomical structures. Casilla D Temuco – Chile Tel.: