What are Vallecular and Carinal canals?

vallecular canal (cortical canal) In Equisetum and some of its fossil relatives, one of a number of large, air-filled, intercellular channels running the length of each internode and positioned approximately between the vascular bundles. They lie outside and are larger than the carinal canals.

What is the function of Carinal Canal?

Carinal canals are present in vascular bundles. It is present on the inner side of vascular bundles. The function of the carinal canal is a water-conducting channel.

Where are Vallecular canals found?

A longitudinal channel in the stem internode of Equisetum and some of its fossil relatives, positioned radially opposite a longitudinal furrow (valley) between the stem ridges. The vallecular canals are arranged roughly between the vascular bundles.

What is Carinal canal in botany?

(protoxylem lacuna) A longitudinal channel in the stem internode of Equisetum (horsetail) and some of its fossil relatives, positioned radially opposite a raised stem ridge (carina). Each carinal canal is arranged on the inner side of a vascular bundle.

Where is the Vallecula Epiglottica located?

Anatomical Parts The epiglottic vallecula is a depression just behind the root of the tongue between the medial and lateral glosso-epiglottic folds in the throat. These depressions serve as “spit traps”; saliva is temporarily held in the valleculae to prevent initiation of the swallowing reflex.

How many types of canals are found in Equisetum?

1. Absence of all three types of canal, i.e., vallecular canal, carinal canal and central canal.

Where the Vallecular canals are present in Equisetum stem?

How is Carinal canal formed?

The carinal canals, connecting consecutive rings of nodal xylem, are formed by the disruption and dissolution of protoxylem elements during elongation of the internodes. Their inner surface appears smooth compared with that of vallecular canals.

What is the Vallecula Epiglottica?

The epiglottic vallecula consists of a small mucosa-lined depression (vallecula) located at the base of the tongue just between the folds of the throat on either side of the median glossoepiglottic fold. It is usually not seen by the naked eye as it is far back and deep at the root of the tongue.

What is a Vallecular cyst?

Vallecular cysts are benign retention cysts of the minor salivary glands. The commonest site is the lingual surface of epiglottis. They distort the epiglottis when they increase in size and eventually fill the vallecula. Blockage of the laryngeal inlet causing severe respiratory distress is an unusual presentation.

What is Equisetum cone?

The spores are borne under sporangiophores in strobili, cone-like structures at the tips of some of the stems. In many species the cone-bearing shoots are unbranched, and in some (e.g. E. palustre, marsh horsetail) they are very similar to sterile shoots, photosynthetic and with whorls of branches.

What type of stele is found in Equisetum?

Stele is of ectophloic siphonostelic type. ADVERTISEMENTS: 15. Each vascular bundle is conjoint, collateral, closed, and consists of xylem, phloem and some parenchyma.