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12-E. The diagonal band of Broca is the medial border of the anterior perforated substance.
This fiber bundle contains amygdaloseptal and septoamygdalar fibers. The nucleus of the diag-
onal band projects via the fornix to the hippocampal formation.
13-A. The stria terminalis and the vena terminalis lie in the sulcus terminalis between the
thalamus and the caudate nucleus.
14-D. The tractus retroflexus contains habenulointerpeduncular fibers that project from the
habenular nuclei of the epithalamus to the interpeduncular nucleus of the midbrain tegmen-
15-A. The stria terminalis is a major efferent pathway from the amygdala. It projects to the
septal area and to the bed nucleus of the stria terminalis.
16-C. Both the hippocampal formation and the amygdala are found in the parahippocampal
gyrus of the temporal (limbic) lob e.
17-C. The hippocampal formation and the amygdala are both involved in Kliiver-Bucy syn-
18-A. The amygdala projects via the stria terminalis and via the ventral amygdalofugal path-
way. The stria terminalis is the most prominent projection from the amygdaloid comple x.
19-A. The amygdala receives both direct and indirect olfactory input.
Basal Ganglia and the
Striatal Motor System
I. Basal Ganglia (Figure 21-1)
-consist of subcortical nuclei (gray matter) located within the cerebral hemi-
1. Caudate nucleus
3. Globus pallidus
4. Amygdala (amygdaloid nuclear complex) [See Chapter 20 III A 7]
—is located between the putamen and the insular cortex and between
the external capsule and the extreme capsul e.
B. Groupings of the basal ganglia
1. Striatum (neostriatum)
-consists of the caudate nucleus and the putamen, which are similar
in structure and connections and have a common embryological origin.
2. Lentiform nucleus
-consists of the putamen and the globus pallidus.
3. Corpus striatum
-consists of the lentiform nucleus and the caudate nucleus.
II. Striatal Motor System (see Figure 21-1)
-is also called the extrapyramidal motor system.
-plays a role in the initiation and execution of somatic motor activity, espe-
cially willed movemen t.
-is involved in automatic stereotyped motor activity of a postural and reflex
318 / Neuroanatomy