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Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

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Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
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Classification of Skeletal Muscle Fibers01:48

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
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The naming of the approximately 700 muscles in the human body is based on a set of criteria designed to provide descriptive information about each muscle, making it easier to identify and remember them.
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A new morphological classification for the fibularis quartus muscle.

Mi-Sun Hur1, Hyung-Sun Won, In-Hyuk Chung

  • 1Department of Anatomy, Kwandong University College of Medicine, Room 503, Naegok-Dong 522, Gangneung, 210-701, South Korea, mshur@kd.ac.kr.

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The fibularis quartus muscle (FQ) was found in 16.3% of Korean cadavers, with varied origins and insertions. This study classifies these anatomical variations for better identification and surgical planning.

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Area of Science:

  • Anatomy
  • Morphology
  • Human Anatomy

Background:

  • The fibularis quartus muscle (FQ) is an accessory muscle in the fibular region.
  • Reported prevalence of the FQ in humans varies, up to 22%.

Purpose of the Study:

  • To classify the morphological patterns of the fibularis quartus muscle.
  • To document the anatomical variations of the fibularis quartus muscle.

Main Methods:

  • Examination of 80 lower limbs from 40 adult Korean cadavers.
  • Analysis of the origin, insertion, and morphological characteristics of the fibularis quartus muscle.

Main Results:

  • The fibularis quartus muscle was identified in 16.3% (13/80) of specimens.
  • Fifteen instances of the FQ were observed across 13 specimens, with two specimens exhibiting duplicate FQs.
  • Observed origins included the fibularis brevis muscle (15%) and other structures (3.8%), with diverse insertion sites such as the calcaneus, peroneal retinaculum, and fifth metatarsal bone.

Conclusions:

  • A novel classification for the fibularis quartus muscle and its variations has been established.
  • Detailed data are provided for accurate identification of the FQ.
  • Findings support improved surgical planning and understanding of fibularis quartus muscle anatomy.