Table IV.

The frequency of occurrence of morphological types of the septomarginal trabecula in the respective age groups

Morphological types of the septomarginal trabecula	Fetuses	Children	Adults
I. Anterior papillary muscle not connected with the trabecula
Sub-type a	4	2	-
Sub-type b	1	1	3
II. One-part trabecula, connecting with the anterior wall and the trunk of the anterior papillary muscle
Sub-type a	4	3	7
Sub-type b	9	6	1
II. One-part trabecula, connecting with the anterior wall and the trunk of the anterior papillary muscle
III. One-part trabecula, connecting only with the trunk of the anterior papillary muscle
Sub-type a	34	33	35
Sub-type b	6	7	10
IV. Two-part trabecula
Sub-type a	-	2	12
Sub-type b	2	3	19
Sub-type c	-	3	13
	60	60	100