The infantry brigade combat team, as of 2014, contains 4,413 soldiers and is organized around three battalions of infantry. Each type of brigade (light infantry, air assault, or airborne) has the same basic organization.
2.1 Structure and function of the outer and middle ear. Figure 1 is a diagram of the human ear. The outer ear consists of the visible part of the ear or pinna, the external auditory canal (meatus) , and the tympanic membrane (tympanum) or eardrum.The human pinna is formed primarily of cartilage and is attached to the head by muscles and ligaments.igure 1 is a diagram of the human ear. The outer ear consists of the visible part of the ear or pinna, the external auditory canal (meatus) , and the tympanic membrane (tympanum) or eardrum.
The ear is divided into three portions: 1  The external ear consists of the prominent earflap or pinna (also called the auricle) and the external ear canal (also called the auditory canal or meatus). 2  The pinna is a funnel-shaped structure that collects sound and directs it into the external ear canal.he ear is divided into three portions: 1  The external ear consists of the prominent earflap or pinna (also called the auricle) and the external ear canal (also called the auditory canal or meatus). 2  The pinna is a funnel-shaped structure that collects sound and directs it into the external ear canal.