2014年1月29日 · We propose that a simple apical organ - comprising an apical tuft and a basal plexus innervated by sensory-neurosecretory apical plate cells - was present in the last common ancestors of cnidarians and bilaterians. One of its ancient functions would have been the control of metamorphosis.

2015年2月1日 · Apical organs are sensory structures present in many marine invertebrate larvae where they are considered to be involved in their settlement, metamorphosis and locomotion.

2023年12月28日 · The apical organ is a larval neurosecretory structure identified in diverse groups of marine invertebrates and located at the frontal region of the larvae.

Apical (or the apex) refers to the tip of a rounded or pyramid-shaped structure. It usually faces opposite the base of that specific body part. For instance, the apical part of the lung lies at the level of the inlet of thoracic cavity, and it faces opposite the base of the lung which lies on the diaphragm. Similarly, apex of the heart lies at ...

Apical cells are slender cells extending from the basement membrane to the lumen and thus have the appearance of apical location. You might find these chapters and articles relevant to this topic.

We propose that a simple apical organ - comprising an apical tuft and a basal plexus innervated by sensory-neurosecretory apical plate cells - was present in the last common ancestors of cnidarians and bilaterians. One of its ancient functions would have been the control of metamorphosis.

According to both the Oxford and Webster dictionaries, ‘apex’ is defined as ‘the highest or topmost point’ of a structure. In plants, an apex constitutes the tip of a shoot or a root. The word ‘apical’, therefore, means relating to, located or situated at, or constituting, an apex.

2024年6月16日 · The apical organ is a sensory structure found in the larvae of some marine invertebrates, such as echinoderms. It helps the larvae to sense light, gravity, and other...

In the context of epithelial tissue in anatomy and physiology, "apical" refers to the uppermost layer or surface of cells that is exposed either to the external environment or to an internal body space. It contrasts with the basal side, which faces toward the underlying body structures.

Relating to the apex or tip of a pyramidal or pointed structure. 2. Situated nearer to the apex of a structure in relation to a specific reference point; opposite of basal. 3. Synonym (s): point of …