different between unipennate vs bipennate

English

Etymology

uni- +? pennate

Adjective

unipennate (not comparable)

1. (medicine, anatomy, zoology) Of, pertaining to, or having the nature of a muscle, the parallel fibres of which attach to a tendon at an acute angle (as a feather that is barbed on one side).
   • 1998, E. J. Brill, Netherlands Journal of Zoology, Volume 48, page 324,

     We applied this method to the proximal aponeurosis of the unipennate medial gastrocnemius muscle (MG) of the cat during active force production at fixed muscle length.

   • 2006, Wistar Institute of Anatomy and Biology, Journal of Morphology, Volume 267, page 593,

     The most distal region of the muscle was again unipennate, with fibers oriented between the posterior aponeurosis and the anterior surface of the muscle (Fig. 1D,E).

   • 2008, William Charles Whiting, Ronald F. Zernicke, Biomechanics of Musculoskeletal Injury, 2nd Edition, page 44,

     Although only one component of the muscle fiber force is used effectively to move the tendon, the advantage of the unipennate muscle system is that an increased number of sarcomeres can be placed in parallel to increase the effective force of the muscle (figure 2.19}.

Related terms

• bipennate
• multipennate

Translations

See also

• Unipennate muscle on Wikipedia.Wikipedia

English

Etymology

From bi- +? pennate.

Adjective

bipennate (not comparable)

1. (medicine, anatomy, zoology) Of, pertaining to, or having the nature of a muscle, the fibres of which attach to a tendon on two sides (as a feather barbed on both sides).
   • 2007, Neal S. Elattrache, Christopher D. Harner, Raffy Mirzayan, Jon K. Sekiya (editors), Surgical Techniques in Sports Medicine, page 50,

     Beneath the deltoid lies the external rotators of the shoulders, including the bipennate infraspinatus and the teres minor (Fig. 5-20B).

   • 2008, John O'Neill, Musculoskeletal Ultrasound: Anatomy and Technique, page 4,

     Bipennate muscles have a central tendon with oblique insertion fibers on both sides, eg, the rectus femoris (Figure 1.3c).

2. (botany, of leaves) Bipinnate (pinnate and having a pinnate leaflet).
   • 1849, Adrien de Jussieu, James Hewetson Wilson, The Elements of Botany, page 501,

     Its bipennate leaves are composed of a slightly straightened general petiole, of four partial petioles, situated, two at the extremity of the proceeding, and convergent, two a little lower, and growing almost at right angles; each of them bearing more than twenty pairs of small horizontal petioles.

   • 1897, William Thomas Fernie, Herbal Simples Approved for Modern Uses of Cure, 2006 Gutenberg eBook edition,

     But this Burnet Pimpinella is of a different (Umbelliferous) order, though similarly styled because its leaves are likewise bipennate.

3. Having two wings; bipennated.

Related terms

• multipennate
• unipennate

Translations

See also

• Bipennate muscle on Wikipedia.Wikipedia

Italian

Adjective

bipennate

1. feminine plural of bipennato