Difference Between Endomysium and Sarcolemma

Thekey differencebetween endomysium and sarcolemma is that内膜是connective tissuethat surrounds amuscle cell而肌肉是质膜of a muscle cell.

Muscle tissue is one of the four main types of tissues present in our body. The muscle cell is the structural unit of muscle tissue. The细胞质of the muscle cell is known as the sarcoplasm, and the plasma membrane is known as the sarcolemma. A thin layer of connective tissue called endomysium surrounds a muscle cell. Therefore, endomysium lies adjacent to the sarcolemma.

内容

1.Overview and Key Difference
2.What is Endomysium
3.What is Sarcolemma
4.Similarities Between Endomysium and Sarcolemma
5.并排比较 - 表格形式的内象与肌膜
6.概括

What is Endomysium?

Endomysium is a layer of connective tissue which surrounds individual muscle cells. Thus, endomysium is adjacent to the sarcolemma of the muscle cell. We can see endomysium in between each individual muscle cell. Endomysium contains capillaries and nerves. Collagen is the main protein in endomysium.

Functionally, endomysium aids in providing an appropriate chemical environment for the exchange of calcium, sodium, and potassium, which are essential for the excitation and subsequent contraction of a muscle fibre. Furthermore, endomysium interacts with epimysium and perimysium and creates the collagen fibres of tendons, which provide the tissue connection between muscles and bones.

什么是肌膜？

Sarcolemma is the plasma membrane of the muscle cell. It is composed of a phospholipid bilayer comprising of hydrophilic heads and hydrophobic tails. The sarcolemma also contains an outer polysaccharide layer known as the glycocalyx. The sarcolemma forms the dynamic outer membrane and is the boundary to the muscle cell contents. The muscle cell contents are embedded in the sarcoplasm.

The muscle cell plasma membrane (sarcolemma) has specialized structures known as transverse tubules. Transverse tubules are invaginations of the sarcolemma. These membranous invaginations extend longitudinally into the cytoplasm of the muscle cell. The transverse tubules are also referred to as T tubules. The terminal cisternae are formed on either side of the t tubules. When the t tubule is surrounded by two cisterns, it is referred to as a triad.

The main function of the sarcolemma, in terms of muscle contraction, is to facilitate the permeability of Calcium ions required for the contraction process. Calcium ions are transported across the sarcolemma via ion channels and are transported into the cytoplasm of the muscle cell (sarcoplasm) via the transverse tubules. And, this will initiate the muscle action potential to bring about muscle contraction. Sarcolemma also contains various signal receiving receptors, which are required in controlling the muscle cell activities.

What are the Similarities Between Endomysium and Sarcolemma?

• Endomysium and sarcolemma are found in muscle tissue.
• Both sarcolemma and endomysium surround individual muscle cells.
• 他们彼此相邻。实际上，内体围绕肌膜。

What is the Difference Between Endomysium and Sarcolemma?

内膜是围绕单个肌肉细胞的结缔组织的薄层，而肌膜是每个肌肉细胞的质膜。因此，这是内象和肌膜之间的关键区别。此外，肌膜是一种磷脂双层，而内体是结缔组织。

下面的图表列出了不同选择ween endomysium and sarcolemma.

概括– Endomysium vs Sarcolemma

肌肉细胞是肌肉细胞的结构和功能单位。每个肌肉细胞都被称为内体的一层结缔组织所包围。每个肌肉细胞的质膜称为肌膜。内膜围绕着每个肌肉细胞的肌膜。因此，这是内体和肌膜之间的差异。

Reference:

1. “Endomysium.” Wikipedia, Wikimedia Foundation, 18 Aug. 2019,Available here.
2. “Sarcolemma.” Sarcolemma – an Overview | ScienceDirect Topics,Available here.

Image Courtesy:

1.“ Illu肌肉结构”（公共领域）Commons Wikimedia
2. Blausen.com工作人员（2014年）的“ Blausen 0801 Skeletalmuscle”。“ Blausen Medical 2014的医学画廊”。Wikijournal of Medicine 1（2）。doi：10.15347/wjm/2014.010。ISSN 2002-4436。- 自己的工作(CC BY 3.0)通过Commons Wikimedia